U.S. patent application number 17/157887 was filed with the patent office on 2021-05-20 for display device.
The applicant listed for this patent is Samsung Display Co., Ltd.. Invention is credited to Seung Wook CHANG, Jae Hoon HWANG, Byoung Seong JEONG, Hyun Shik LEE, Young Hee LEE, Sang Woo PYO, Ji Hwan YOON.
Application Number | 20210151510 17/157887 |
Document ID | / |
Family ID | 1000005362410 |
Filed Date | 2021-05-20 |
View All Diagrams
United States Patent
Application |
20210151510 |
Kind Code |
A1 |
LEE; Young Hee ; et
al. |
May 20, 2021 |
DISPLAY DEVICE
Abstract
A display device includes a first base member having a first
light-emitting area, a second light-emitting area, and a
non-light-emitting area between the first and second light-emitting
areas; a second base member on the first base member; a first color
filter on a first surface of the second base member that faces the
first base member and overlapping with the first light-emitting
area; a second color filter on the first surface of the second base
member and overlapping with the second light-emitting area; a color
pattern on the first surface of the second base member, between the
first and second color filters, and overlapping with the
non-light-emitting area; a light-shielding member on the color
pattern and overlapping with the non-light-emitting area; and a
first wavelength conversion pattern on the second color filter and
including a first wavelength shifter.
Inventors: |
LEE; Young Hee; (Suwon-si,
KR) ; LEE; Hyun Shik; (Incheon, KR) ; CHANG;
Seung Wook; (Suwon-si, KR) ; JEONG; Byoung Seong;
(Suwon-si, KR) ; PYO; Sang Woo; (Seongnam-si,
KR) ; HWANG; Jae Hoon; (Seoul, KR) ; YOON; Ji
Hwan; (Yongin-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Display Co., Ltd. |
Yongin-si |
|
KR |
|
|
Family ID: |
1000005362410 |
Appl. No.: |
17/157887 |
Filed: |
January 25, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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16741599 |
Jan 13, 2020 |
10923538 |
|
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17157887 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01L 51/5206 20130101;
H01L 51/5237 20130101; H01L 51/502 20130101; H01L 51/5234 20130101;
H01L 27/322 20130101 |
International
Class: |
H01L 27/32 20060101
H01L027/32; H01L 51/50 20060101 H01L051/50; H01L 51/52 20060101
H01L051/52 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 15, 2019 |
KR |
10-2019-0043835 |
Claims
1. A display device comprising: a first base member including a
first area, a second area, and a third area between the first area
and the second area; a first anode electrode on the first base
member and located in the first area; a second anode electrode on
the first base member and located in the second area;
light-emitting layers on the first anode electrode and the second
anode electrode; a cathode electrode on the light-emitting layers;
a second base member on the cathode electrode, the second base
member including a first surface facing the first base member; a
first color filter on the first surface of the second base member
and overlapping with the first area; a second color filter on the
first surface of the second base member and overlapping with the
second area; a color pattern on the first surface of the second
base member, the color pattern being between the first color filter
and the second color filter, the color pattern overlapping with the
third area; and a first wavelength conversion pattern on the second
color filter and comprising a first wavelength shifter, wherein the
light-emitting layers comprise a first light-emitting layer, a
second light-emitting layer overlapping the first light-emitting
layer, and a third light-emitting layer overlapping the first
light-emitting layer and the second light-emitting layer, the first
light-emitting layer, the second light-emitting layer, and the
third light-emitting layer are to emit light having a peak
wavelength of about 440 nm to about 610 nm, one of the first
light-emitting layer, the second light-emitting layer, and the
third light-emitting layer is to emit light of a first peak
wavelength, and another one of the first light-emitting layer, the
second light-emitting layer, and the third light-emitting layer is
to emit light of a second peak wavelength different from the first
peak wavelength.
2. The display device of claim 1, wherein the first peak wavelength
ranges from 440 nm to 480 nm, and the second peak wavelength ranges
from 510 nm to 550 nm.
3. The display device of claim 1, wherein the first peak wavelength
ranges from 440 nm to 480 nm, and the second peak wavelength ranges
from 460 nm to 480 nm.
4. The display device of claim 1, wherein the light-emitting layers
further comprise a fourth light-emitting layer overlapping the
first light-emitting layer, the second light-emitting layer, and
the third light-emitting layer, and the fourth light-emitting layer
is to emit light having a peak wavelength of 440 nm to 610 nm.
5. The display device of claim 4, wherein one of the first
light-emitting layer, the second light-emitting layer, the third
light-emitting layer and the fourth light-emitting layer is to emit
green light, and another three of the first light-emitting layer,
the second light-emitting layer, the third light-emitting layer and
the fourth light-emitting layer are to emit blue light.
6. The display device of claim 1, wherein the first color filter
and the color pattern comprise a blue colorant, and the second
color filter comprises another colorant different from the blue
colorant.
7. The display device of claim 6, wherein a thickness of the first
color filter is substantially the same as a thickness of the color
pattern.
8. The display device of claim 1, wherein a portion of the second
color filter overlaps the color pattern, and wherein the second
color filter comprises a colorant different from a colorant
included in the color pattern.
9. The display device of claim 1, further comprising: a
light-transmitting pattern on the first color filter, wherein the
light-transmitting pattern comprises a base resin and a scatterer
in the base resin.
10. The display device of claim 9, further comprising: a first
capping layer on the first surface of the second base member and
covering the first color filter, the second color filter, and the
color pattern, wherein the first capping layer comprises an
inorganic material, and the light-transmitting pattern and the
first wavelength conversion pattern are on the first capping
layer.
11. The display device of claim 10, wherein the first capping layer
is in direct contact with the light-transmitting pattern and the
first wavelength conversion pattern.
12. The display device of claim 10, further comprising: a barrier
wall between the light-transmitting pattern and the first
wavelength conversion pattern; and a second capping layer on the
first capping layer and covering the light-transmitting pattern,
the first wavelength conversion pattern, and the barrier wall,
wherein the barrier wall comprises a light-shielding material.
13. The display device of claim 12, wherein the light-transmitting
pattern and the first wavelength conversion pattern are in direct
contact with the barrier wall.
14. The display device of claim 1, further comprising: an inorganic
layer on the cathode electrode; a capping layer on the first
wavelength conversion pattern; and a filler member between the
inorganic layer and the capping layer, wherein the capping layer is
in direct contact with the filler member.
15. The display device of claim 1, further comprising: a third
anode electrode on the first base member and located in a fourth
area, wherein the fourth area is further defined on the first base
member; a third color filter on the first surface of the second
base member and overlapping with the fourth area; and a second
wavelength conversion pattern on the third color filter and
comprising a second wavelength shifter, wherein the light-emitting
layers are further located on the third anode electrode, and the
third color filter comprises a different colorant from the first
color filter and the second color filter.
16. The display device of claim 15, wherein the color pattern is on
the second base member and is further between the second color
filter and the third color filter.
17. The display device of claim 16, wherein the first color filter
and the color pattern comprise a blue colorant, one of the second
and third color filters comprises a red colorant, and one of the
second and third color filters comprises a green colorant.
18. The display device of claim 15, wherein the first wavelength
shifter and the second wavelength shifter comprise quantum
dots.
19. A display device comprising: a base member including a first
area, a second area, and a third area between the first area and
the second area; a first anode electrode on the base member and
overlapping with the first area; a second anode electrode on the
base member and overlapping with the second area; light-emitting
layers on the first anode electrode and the second anode electrode;
a cathode electrode on the light-emitting layers; an inorganic
layer on the cathode electrode; a first color filter on the
inorganic layer and overlapping with the first area; a second color
filter on the inorganic layer and overlapping with the second area;
a color pattern on the inorganic layer, the color pattern being
between the first color filter and the second color filter, and
overlapping with the third area; a light-transmitting pattern
between the first color filter and the inorganic layer; and a
wavelength conversion pattern between the second color filter and
the inorganic layer and comprising a wavelength shifter, wherein
the light-emitting layers comprise a first light-emitting layer, a
second light-emitting layer overlapping the first light-emitting
layer, and a third light-emitting layer overlapping the first
light-emitting layer and the second light-emitting layer, the first
light-emitting layer, the second light-emitting layer, and the
third light-emitting layer are to emit light having a peak
wavelength of about 440 nm to about 610 nm, one of the first
light-emitting layer, the second light-emitting layer, and the
third light-emitting layer is to emit light of a first peak
wavelength, and another one of the first light-emitting layer, the
second light-emitting layer, and the third light-emitting layer is
to emit light of a second peak wavelength different from the first
peak wavelength.
20. The display device of claim 19, wherein the first color filter
and the color pattern comprise a same colorant.
21. The display device of claim 19, wherein a portion of the second
color filter overlaps the color pattern.
22. The display device of claim 19, wherein the light-emitting
layers further comprise a fourth light-emitting layer overlapping
the first light-emitting layer, the second light-emitting layer,
and the third light-emitting layer, and the fourth light-emitting
layer is to emit light having a peak wavelength of 440 nm to 610
nm.
23. The display device of claim 22, wherein one of the first
light-emitting layer, the second light-emitting layer, the third
light-emitting layer and the fourth light-emitting layer is to emit
green light, and another three of the first light-emitting layer,
the second light-emitting layer, the third light-emitting layer and
the fourth light-emitting layer are to emit blue light.
24. The display device of claim 19, further comprising: a barrier
wall on the inorganic layer, the barrier wall being between the
light-transmitting pattern and the wavelength conversion pattern;
and a capping layer covering the light-transmitting pattern, the
wavelength conversion pattern, and the barrier wall, wherein the
first color filter and the second color filter are on the capping
layer.
25. The display device of claim 24, wherein the barrier wall
comprises a light-shielding material.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 16/741,599, filed Jan. 13, 2020, which claims
priority to and the benefit of Korean Patent Application No.
10-2019-0043835, filed Apr. 15, 2019, the entire content of both of
which is incorporated herein by reference.
BACKGROUND
1. Field
[0002] The present disclosure relates to a display device.
2. Description of the Related Art
[0003] Display devices have become of increasingly greater
importance with the development of multimedia. Accordingly, various
display devices (such as a liquid crystal display (LCD) device, an
organic light-emitting diode (OLED) display device, or the like)
have been developed.
[0004] Meanwhile, a self-luminous display device includes
self-luminous elements, e.g., OLEDs. Each of the self-luminous
elements may include two electrodes which face each other and a
light-emitting layer which is interposed between the two
electrodes. In a case where the self-luminous elements are OLEDs,
electrons and holes from the two electrodes recombine in the
light-emitting layer to generate excitons, and light can be emitted
in response to the transition of the excitons from the excited
state to the base state.
[0005] Because the self-luminous display device does not need a
separate light source, the self-luminous display device has become
increasingly more popular as a next-generation display device
because of its low power consumption, thinness, and numerous
high-quality characteristics such as wide viewing angles, high
luminance, excellent contrast ratio, and fast response speed.
[0006] Meanwhile, in order to allow each pixel of a display device
to uniquely display a single basic color, a method in which a color
conversion pattern or a wavelength conversion pattern is disposed
in each pixel on the path of light from a light source to a viewer
has been suggested.
SUMMARY
[0007] Aspects according to embodiments of the present disclosure
are directed toward a display device capable of improving display
quality.
[0008] However, embodiments of the present disclosure are not
restricted to those set forth herein. The above and other aspects
of the present disclosure will become more apparent to one of
ordinary skill in the art to which the present disclosure pertains
by referencing the detailed description of the present disclosure
given below.
[0009] According to an embodiment of the present disclosure, a
display device includes: a first base member having a first
light-emitting area, a second light-emitting area, and a
non-light-emitting area between the first and second light-emitting
areas; a first anode electrode on the first base member and located
in the first light-emitting area; a second anode electrode on the
first base member and located in the second light-emitting area;
light-emitting layers on the first and second anode electrodes; a
cathode electrode on the light-emitting layers; a second base
member on the cathode electrode, the second base member having a
first surface facing the first base member; a first color filter on
the first surface of the second base member and overlapping with
the first light-emitting area; a second color filter on the first
surface of the second base member and overlapping with the second
light-emitting area; a color pattern on the first surface of the
second base member, the color pattern being between the first and
second color filters, and overlapping with the non-light-emitting
area; a light-shielding member on the color pattern and overlapping
with the non-light-emitting area; and a first wavelength conversion
pattern on the second color filter and including a first wavelength
shifter, wherein the light-emitting layers include first, second,
and third light-emitting layers overlapping with one another, the
first, second, and third light-emitting layers are to emit light
having a peak wavelength of about 440 nm to about 610 nm, one of
the first, second, and third light-emitting layers is to emit light
of a first peak wavelength, and another one of the first, second,
and third light-emitting layers is to emit light of a second peak
wavelength different from the first peak wavelength.
[0010] According to an embodiment of the present disclosure, a
display device includes a base member having a first light-emitting
area, a second light-emitting area, and a non-light-emitting area
between the first and second light-emitting areas; a first anode
electrode on the base member and located in the first
light-emitting area; a second anode electrode on the base member
and located in the second light-emitting area; light-emitting
layers on the first and second anode electrodes; a cathode
electrode on the light-emitting layers; a thin-film encapsulation
layer on the cathode electrode; a first color filter on the
thin-film encapsulation layer and overlapping with the first
light-emitting area; a second color filter on the thin-film
encapsulation layer and overlapping with the second light-emitting
area; a color pattern on the thin-film encapsulation layer, the
color pattern between the first and second color filters, and
overlapping with the non-light-emitting area; a light-shielding
member on the color pattern and overlapping with the
non-light-emitting area; a light-transmitting pattern between the
first color filter and the thin-film encapsulation layer; and a
wavelength conversion pattern between the second color filter and
the thin-film encapsulation layer and including a wavelength
shifter, wherein the light-emitting layers include first, second,
and third light-emitting layers overlapping with one another, the
first, second, and third light-emitting layers are to emit light
having a peak wavelength of about 440 nm to about 610 nm, one of
the first, second, and third light-emitting layers is to emit light
of a first peak wavelength, and another one of the first, second,
and third light-emitting layers is to emit light of a second peak
wavelength different from the first peak wavelength.
[0011] According to the aforementioned and other embodiments of the
present disclosure, a display device with an improved display
quality can be provided.
[0012] Other features and embodiments may be apparent from the
following detailed description, the drawings, and the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The above and other embodiments and features of the present
disclosure will become more apparent by describing in more detail
embodiments thereof with reference to the attached drawings, in
which:
[0014] FIG. 1 is a perspective view of a display device according
to an embodiment of the present disclosure;
[0015] FIG. 2 is a cross-sectional view, taken along the line
Xa-Xa' of FIG. 1, of the display device of FIG. 1;
[0016] FIG. 3 is a plan view illustrating a display substrate in a
display area of the display device of FIG. 1;
[0017] FIG. 4 is a plan view illustrating a color conversion
substrate in the display area of the display device of FIG. 1;
[0018] FIG. 5 is a cross-sectional view, taken along the line
X1-X1' of FIG. 3 or 4, of the display device of FIG. 1;
[0019] FIG. 6 is an enlarged cross-sectional view of a part Q of
FIG. 5;
[0020] FIG. 7 is an enlarged cross-sectional view of a modified
example of the part Q of FIG. 6;
[0021] FIG. 8 is a cross-sectional view, taken along the line
X2-X2' of FIG. 3 or 4, of the display device of FIG. 1;
[0022] FIG. 9 is a cross-sectional view, taken along the line
X3-X3' of FIG. 3 or 4, of the display device of FIG. 1;
[0023] FIG. 10 is a cross-sectional view, taken along the line
X4-X4' of FIG. 3 or 4, of the display device of FIG. 1;
[0024] FIG. 11 is a cross-sectional view, taken along the line
X5-X5' of FIG. 3 or 4, of the display device of FIG. 1;
[0025] FIG. 12 is a plan view illustrating the arrangement of first
color filters and color patterns in the color conversion substrate
of the display device of FIG. 1;
[0026] FIG. 13 is a plan view illustrating the arrangement of a
light-shielding member in the color conversion substrate of the
display device of FIG. 1;
[0027] FIG. 14 is a plan view illustrating the arrangement of
second color filters and third color filters in the color
conversion substrate of the display device of FIG. 1;
[0028] FIG. 15 is a plan view illustrating the arrangement of first
wavelength conversion patterns, second wavelength conversion
patterns, and light-transmitting patterns in the color conversion
substrate of the display device of FIG. 1;
[0029] FIG. 16 is a cross-sectional view, taken along the line
X1-X1' of FIG. 3 or 4, of a display device according to another
embodiment of the present disclosure;
[0030] FIG. 17 is a plan view illustrating the arrangement of
barrier walls in a color conversion substrate of the display device
of FIG. 16;
[0031] FIG. 18 is a plan view illustrating the arrangement of first
wavelength conversion patterns, second wavelength conversion
patterns, and light-transmitting patterns in the color conversion
substrate of the display device of FIG. 16;
[0032] FIG. 19 is a cross-sectional view, taken along the line
X1-X1' of FIG. 3 or 4, of a display device according to another
embodiment of the present disclosure; and
[0033] FIG. 20 is a cross-sectional view, taken along the line
X1-X1' of FIG. 3 or 4, of a display device according to another
embodiment of the present disclosure.
DETAILED DESCRIPTION
[0034] Features of the inventive concept and methods of
accomplishing the same may be understood more readily by reference
to the following detailed description of embodiments and the
accompanying drawings. The inventive concept may, however, be
embodied in many different forms and should not be construed as
being limited to the embodiments set forth herein. Rather, these
embodiments are provided so that this disclosure will be thorough
and complete and will fully convey the concept of the inventive
concept to those skilled in the art. The inventive concept will
only be defined by the appended claims, and equivalents thereof.
Like reference numerals refer to like elements throughout the
specification.
[0035] It will be understood that when an element or layer is
referred to as being "on", "connected to" or "coupled to" another
element or layer, it can be directly on, connected or coupled to
the other element or layer, or intervening elements or layers may
be present. In contrast, when an element is referred to as being
"directly on", "directly connected to" or "directly coupled to"
another element or layer, there are no intervening elements or
layers present. As used herein, the term "and/or" includes any and
all combinations of one or more of the associated listed items.
[0036] Spatially relative terms, such as "beneath," "below,"
"lower," "above," "upper" and the like, may be used herein for ease
of description to describe one element or feature's relationship to
another element(s) or feature(s) as illustrated in the figures. It
will be understood that the spatially relative terms are intended
to encompass different orientations of the device in use or
operation in addition to the orientation depicted in the figures.
For example, if the device in the figures is turned over, elements
described as "below" or "beneath" other elements or features would
then be oriented "above" the other elements or features. Thus, the
exemplary term "below" can encompass both an orientation of above
and below. The device may be otherwise oriented (rotated 90 degrees
or at other orientations) and the spatially relative descriptors
used herein may be interpreted accordingly.
[0037] It will be understood that, although the terms first,
second, etc., may be used herein to describe various elements,
components, regions, layers and/or sections, these elements,
components, regions, layers and/or sections should not be limited
by these terms. These terms are only used to distinguish one
element, component, region, layer or section from another element,
component, region, layer or section. Thus, a first element,
component, region, layer or section discussed below could be termed
a second element, component, region, layer or section without
departing from the teachings of the inventive concept.
[0038] Embodiments to be described herein will be described with
reference to plan views and cross-sectional views, which are ideal
schematic views of embodiments of the present invention. Thus,
illustrations may be modified by manufacturing techniques and/or
tolerances. Accordingly, the embodiments of the present invention
are not limited to specific forms, and also include the variations
caused according to the manufacturing process. Therefore, the
regions illustrated in the drawings have schematic attributes, and
the shapes of the regions illustrated in the drawings are intended
to illustrate specific types of regions of the elements and are not
intended to limit the scope of the invention.
[0039] Embodiments of the present disclosure will hereinafter be
described with reference to the attached drawings.
[0040] FIG. 1 is a perspective view of a display device according
to an embodiment of the present disclosure, FIG. 2 is a
cross-sectional view, taken along the line Xa-Xa' of FIG. 1, of the
display device of FIG. 1, and FIG. 3 is a plan view illustrating a
display substrate in a display area of the display device of FIG.
1.
[0041] Referring to FIGS. 1 through 3, a display device 1 may be
applied to various electronic devices, such as a tablet personal
computer (PC), a smartphone, a vehicular navigation unit, a camera,
a central information display (CID), a wristwatch-type electronic
device, a personal digital assistant (PDA), a portable multimedia
player (PMP), a mid- or small-size electronic device (e.g., a
gaming console), or a mid- to large-size electronic device (e.g., a
television (TV), an outside billboard, a monitor, a PC, or a
notebook computer). However, the present disclosure is not limited
to this, and the display device 1 may also be applied to various
other suitable electronic devices without departing from the
inventive concept of the present disclosure.
[0042] In some embodiments, the display device 1 may have a
rectangular shape in a plan view. The display device 1 may include
two first sides extending in a first direction D1 and two second
sides extending in a second direction D2 that intersects (e.g.,
crosses) the first direction D1. The corners at which the first
sides and the second sides of the display device 1 meet may be
right-angled or curved. In some embodiments, the first sides may be
shorter than the second sides, but the present disclosure is not
limited thereto. The planar shape of the display device 1 is not
particularly limited, and the display device 1 may have a circular
shape or another suitable shape in a plan view.
[0043] The display device 1 may include a display area DA in which
images are displayed and a non-display area NDA in which no images
are displayed. In some embodiments, the non-display area NDA may be
disposed on the periphery of the display area DA and may surround
the display area DA.
[0044] Unless specified otherwise, the terms "on", "upper", "top",
and "top surface", as used herein, refer to a third direction D3
that intersects (e.g., crosses) the first and second directions D1
and D2, and the terms "below", "lower", "bottom", and "bottom
surface", as used herein, refer to the opposite direction of the
third direction D3.
[0045] In some embodiments, the display device 1 may include a
display substrate 10, a color conversion substrate 30 which faces
the display substrate 10, and a sealing member 50 which couples the
display substrate 10 and the color conversion substrate 30. The
display device 1 may further include a filler member 70 which is
filled between the display substrate 10 and the color conversion
substrate 30.
[0046] The display substrate 10 may include elements and circuits
for displaying images, e.g., pixel circuits such as switching
elements, a pixel-defining film for defining light-emitting areas
and a non-light-emitting area in the display area DA, and
self-luminous elements. For example, the self-luminous elements may
be organic light-emitting diodes (OLEDs), quantum-dot
light-emitting diodes (QLEDs), inorganic material-based
micro-light-emitting diodes (microLEDs), or inorganic
material-based nano-light-emitting diodes (nanoLEDs). For
convenience, it is assumed that the self-luminous elements are, for
example, OLEDs.
[0047] The color conversion substrate 30 may be disposed on the
display substrate 10 and may face the display substrate 10. In some
embodiments, the color conversion substrate 30 may include color
conversion patterns which convert the color of incident light. In
some embodiments, the color conversion patterns may include color
filters and/or wavelength conversion patterns.
[0048] In the non-display area, the sealing member 50 may be
disposed between the display substrate 10 and the color conversion
substrate 30. The sealing member 50 may be disposed along the edges
of the display substrate 10 or the color conversion substrate 30 to
surround the display area DA in a plan view. The display substrate
10 and the color conversion substrate 30 may be coupled together
via the sealing member 50.
[0049] In some embodiments, the sealing member 50 may be formed of
an organic material. For example, the sealing member 50 may be
formed of an epoxy resin, but the present disclosure is not limited
thereto.
[0050] The filler member 70 may be disposed in the gap between the
display substrate 10 and the color conversion substrate 30,
surrounded by the sealing member 50. The filler member 70 may fill
the gap between the display substrate 10 and the color conversion
substrate 30.
[0051] In some embodiments, the filler member 70 may be formed of a
material capable of transmitting light therethrough. In some
embodiments, the filler member 70 may be formed of an organic
material. For example, the filler member 70 may be formed of a
silicon (Si)-based organic material or an epoxy-based organic
material, but the present disclosure is not limited thereto. In
some embodiments, the filler member 70 may not be provided.
[0052] FIG. 3 is a plan view illustrating the display substrate in
the display area of the display device of FIG. 1, and FIG. 4 is a
plan view illustrating the color conversion substrate in the
display area of the display device of FIG. 1.
[0053] Referring to FIGS. 3 and 4 and again to FIGS. 1 and 2, in
the display area DA, a plurality of light-emitting areas (LA1, LA2,
LA3, LA4, LA5, and LA6) and a non-light-emitting area NLA may be
defined on the display substrate 10. The light-emitting areas (LA1,
LA2, LA3, LA4, LA5, and LA6) may be areas that emit light generated
by the self-luminous elements to the outside of the display
substrate 10, and the non-light-emitting area NLA may be an area
that does not emit light to the outside of the display substrate
10.
[0054] In some embodiments, light emitted from the light-emitting
areas (LA1, LA2, LA3, LA4, LA5, and LA6) to the outside of the
display substrate 10 may have a first color. In some embodiments,
light of the first color may be blue light and may have a peak
wavelength of about 440 nm to about 480 nm.
[0055] In some embodiments, in the display area DA, first
light-emitting areas LA1, second light-emitting areas LA2, and
third light-emitting areas LA3 may be sequentially arranged in a
first row RL1 of the display substrate 10 along the first direction
D1, and fourth light-emitting areas LA4, fifth light-emitting areas
LA5, and sixth light-emitting areas LA6 may be sequentially
arranged, along the first direction D1, in a second row RL2 of the
display substrate 10 which is adjacent to the first row RL1 in the
second direction D2.
[0056] In some embodiments, a first width WL1, in the first
direction D1, of the first light-emitting areas LA1 may be smaller
than a second width WL2, in the first direction D1, of the second
light-emitting areas LA2 and a third width WL3, in the first
direction D1, of the third light-emitting areas LA3. In some
embodiments, the second width WL2 of the second light-emitting
areas LA2 and the third width WL3 of the third light-emitting areas
LA3 may differ from each other. For example, the second width WL2
of the second light-emitting areas LA2 may be greater than the
third width WL3 of the third light-emitting areas LA3. In some
embodiments, the area of the first light-emitting areas LA1 may be
smaller than the areas of the second and third light-emitting areas
LA2 and LA3. The area of the second light-emitting areas LA2 may be
smaller or greater than the area of the third light-emitting areas
LA3. However, the present disclosure is not limited to this. In
other embodiments, the first width WL1 of the first light-emitting
areas LA1, the second width WL2 of the second light-emitting areas
LA2, and the third width WL3 of the third light-emitting areas LA3
may all be substantially the same. Also, in other embodiments, the
areas of the first, second, and third light-emitting areas LA1,
LA2, and LA3 may all be substantially the same.
[0057] The fourth light-emitting areas LA4, which are adjacent to
the respective first light-emitting areas LA1 in the second
direction D2, differ from the first light-emitting areas LA2 only
in that they are disposed in the second row RL2, and may be
substantially the same as the first light-emitting areas LA1 in
terms of the width and area thereof and the configuration of
elements therein.
[0058] Similarly, the second and fifth light-emitting areas LA2 and
LA5, which are adjacent to each other in the second direction D2,
may have substantially the same structure, and the third and sixth
light-emitting areas LA3 and LA6, which are adjacent to each other
in the second direction D2, may have substantially the same
structure.
[0059] In the display area DA, a plurality of light-transmitting
areas (TA1, TA2, TA3, TA4, TA5, and TA6) and a light-blocking area
BA may be defined on the color conversion substrate 30. The
light-transmitting areas (TA1, TA2, TA3, TA4, TA5, and TA6) may be
areas that provide light emitted from the display substrate 10
through the color conversion substrate 30 to the outside of the
display device 1. The light-blocking area BA may be an area that
does not transmit light emitted from the display substrate 10
therethrough.
[0060] In some embodiments, in the display area DA, first
light-transmitting areas TA1, second light-transmitting areas TA2,
and third light-transmitting areas TA3 may be sequentially arranged
in a first row RT1 of the color conversion substrate 30 along the
first direction D1. The first light-transmitting areas TA1 may
correspond to, or overlap with, the first light-emitting areas LA1.
Similarly, the second light-transmitting areas TA2 and the third
light-transmitting areas TA3 may correspond to, or overlap with,
the second light-emitting areas LA2 and the third light-emitting
areas LA3, respectively.
[0061] In some embodiments, light of the first color provided by
the display substrate 10 may be provided to the outside of the
display device 1 through the first, second, and third
light-transmitting areas TA1, TA2, and TA3. The color of the first
emitted light, which is light emitted to the outside of the display
device 1 through the first light-transmitting areas TA1, may be the
first color, the color of the second emitted light, which is light
emitted to the outside of the display device 1 through the second
light-transmitting areas TA2, may be a second color, which is
different from the first color, and the color of light emitted to
the outside of the display device 1 through the third
light-transmitting areas TA3 (e.g., the third emitted light) may be
a third color, which is different from the first and second colors.
In some embodiments, light of the first color may be blue light
having a peak wavelength of about 440 nm to about 480 nm, light of
the second color may be red light having a peak wavelength of about
610 nm to about 650 nm, and light of the third color may be green
light having a peak wavelength of about 510 nm to about 550 nm.
[0062] Fourth, fifth, and sixth light-transmitting areas TA4, TA5,
and TA6 may be sequentially arranged, along the first direction D1,
in a second row RT2 of the color conversion substrate 30 which is
adjacent to the first row RT1 in the second direction D2. The
fourth, fifth, and sixth light-transmitting areas TA4, TA5, and TA6
may correspond to, or overlap with, the fourth, fifth, and sixth
light-emitting areas LA1, LA2, and LA3, respectively.
[0063] In some embodiments, a first width WT1, in the first
direction D1, of the first light-transmitting areas TA1 may be
smaller than a second width WL2, in the first direction D1, of the
second light-transmitting areas TA2 and a third width WL3, in the
first direction D1, of the third light-transmitting areas TA3. In
some embodiments, the second width WL2 of the second
light-transmitting areas TA2 and the third width WL3 of the third
light-transmitting areas TA3 may differ from each other. For
example, the second width WL2 of the second light-transmitting
areas TA2 may be greater than the third width WL3 of the third
light-transmitting areas TA3. In some embodiments, the area of the
first light-transmitting areas TA1 may be smaller than the areas of
the second and third light-transmitting areas TA2 and TA3.
[0064] The first and fourth light-transmitting areas TA1 and TA4,
which are adjacent to each other in the second direction D2, may be
substantially the same in terms of the width and area thereof, the
configuration of elements therein, and the color of light emitted
therefrom to the outside of the display device 1.
[0065] Similarly, the second and fifth light-transmitting areas TA2
and TA5, which are adjacent to each other in the second direction
D2, may have substantially the same structure and may emit light of
substantially the same color to the outside of the display device
1. Also, the third and sixth light-transmitting areas TA3 and TA6,
which are adjacent to each other in the second direction D2, may
have substantially the same structure and may emit light of
substantially the same color to the outside of the display device
1.
[0066] In the display area DA, the light-blocking area BA may be
disposed on the periphery of the light-transmitting areas (TA1,
TA2, TA3, TA4, TA5, and TA6) of the color conversion substrate 30.
In some embodiments, the light-blocking area BA may include first
light-blocking areas BA1, second light-blocking areas BA2, third
light-blocking areas BA3, fourth light-blocking areas BA4, fifth
light-blocking areas BA5, sixth light-blocking areas BA6, and
seventh light-blocking areas BA7.
[0067] The first light-blocking areas BA1 may be disposed between
the respective first light-transmitting areas TA1 and the
respective second light-transmitting areas TA2 along the first
direction D1, the second light-blocking areas BA2 may be disposed
between the respective second light-transmitting areas TA2 and the
respective third light-transmitting areas TA3 along the first
direction D1, and the third light-blocking areas BA3 may be
disposed between the respective third light-transmitting areas TA3
and the respective first light-transmitting areas TA1 along the
first direction D1.
[0068] The fourth light-blocking areas BA4 may be disposed between
the respective fourth light-transmitting areas TA4 and the
respective fifth light-transmitting areas TA5 along the first
direction D1, the fifth light-blocking areas BA5 may be disposed
between the respective fifth light-transmitting areas TA5 and the
respective sixth light-transmitting areas TA6 along the first
direction D1, and the sixth light-blocking areas BA6 may be
disposed between the respective sixth light-transmitting areas TA6
and the respective fourth light-transmitting areas TA4 along the
first direction D1.
[0069] The seventh light-blocking areas BA7 may be disposed between
the first and second rows RT1 and RT2, which are adjacent to each
other in the second direction D2.
[0070] The structure of the display device 1 will hereinafter be
described.
[0071] FIG. 5 is a cross-sectional view, taken along the line
X1-X1' of FIG. 3 or 4, of the display device of FIG. 1, FIG. 6 is
an enlarged cross-sectional view of a part Q of FIG. 5, FIG. 7 is
an enlarged cross-sectional view of a modified example of the part
Q of FIG. 6, FIG. 8 is a cross-sectional view, taken along the line
X2-X2' of FIG. 3 or 4, of the display device of FIG. 1, FIG. 9 is a
cross-sectional view, taken along the line X3-X3' of FIG. 3 or 4,
of the display device of FIG. 1, FIG. 10 is a cross-sectional view,
taken along the line X4-X4' of FIG. 3 or 4, of the display device
of FIG. 1, and FIG. 11 is a cross-sectional view, taken along the
line X5-X5' of FIG. 3 or 4, of the display device of FIG. 1. Here,
the lines X1-X1', X2-X2', X3-X3', X4-X4', and X5-X5' in FIG. 3 are
in the same positions of the display device of FIG. 1 as the
respective lines X1-X1', X2-X2', X3-X3', X4-X4', and X5-X5' in FIG.
4.
[0072] Referring to FIGS. 5 through 11 and again to FIGS. 3-4, the
display device 1 may include the display substrate 10 and the color
conversion substrate 30 and may further include the filler member
70, which is disposed between the display substrate 10 and the
color conversion substrate 30.
[0073] The display substrate 10 will hereinafter be described.
[0074] A first base member 110 may be formed of a material having
transparency. In some embodiments, the first base member 110 may be
a glass substrate or a plastic substrate. In a case where the first
base member 110 is a plastic substrate, the first base member 110
may have flexibility. In some embodiments, the first base member
110 may include a glass or plastic substrate and may further
include a separate layer, e.g., a buffer layer or an insulating
layer, which is disposed on the glass or plastic substrate.
[0075] In some embodiments, as already mentioned above, the
light-emitting areas (LA1, LA2, LA3, LA4, LA5, and LA6) and the
non-light-emitting area NLA may be defined on the first base member
110.
[0076] As illustrated in FIG. 5, switching elements (T1, T2, and
T3) may be disposed on the first base member 110. In some
embodiments, first, second, and third switching elements T1, T2,
and T3 may be disposed in the first, second, and third
light-emitting areas LA1, LA2, and LA3, respectively, but the
present disclosure is not limited thereto. In other embodiments, at
least one of the first, second, and third switching elements T1,
T2, and T3 may be disposed in the non-light-emitting area NLA.
[0077] In some embodiments, the first, second, and third switching
elements T1, T2, and T3 may be thin-film transistors (TFTs)
including polysilicon or an oxide semiconductor.
[0078] In one embodiment, a plurality of signal lines (e.g., gate
lines, data lines, power lines, and/or the like) may be further
disposed on the first base member 110 to transmit signals to the
switching elements (T1, T2, and T3).
[0079] An insulating film 130 may be disposed on the first, second,
and third switching elements T1, T2, and T3. In some embodiments,
the insulating film 130 may be a planarization film. In some
embodiments, the insulating film 130 may be formed as an organic
film. For example, the insulating film 130 may include an acrylic
resin, an epoxy resin, an imide resin, or an ester resin. In some
embodiments, the insulating film 130 may include a positive
photosensitive material or a negative photosensitive material.
[0080] As illustrated in FIGS. 5 and 8 through 10, first, second,
and third anode electrodes AE1, AE2, and AE3 may be disposed on the
insulating film 130. The first anode electrode AE1 may be disposed
in the first light-emitting area LA1 and may at least partially
extend to the non-light-emitting area NLA, the second anode
electrode AE2 may be disposed in the second light-emitting area LA2
and may at least partially extend to the non-light-emitting area
NLA, and the third first anode electrode AE3 may be disposed in the
third light-emitting area LA3 and may at least partially extend to
the non-light-emitting area NLA. The first, second, and third anode
electrodes AE1, AE2, and AE3 may penetrate the insulating film 130
to be connected to the first, second, and third switching elements
T1, T2, and T3, respectively.
[0081] In some embodiments, the first, second, and third anode
electrodes AE1, AE2, and AE3 may have different widths or different
areas. For example, the width of the first anode electrode AE1 may
be smaller than the width of the second anode electrode AE2, and
the width of the third anode electrode AE3 may be smaller than the
width of the second anode electrode AE2, but greater than the width
of the first anode electrode AE1. For example, the area of the
first anode electrode AE1 may be smaller than the area of the
second anode electrode AE2, and the area of the third anode
electrode AE3 may be smaller than the area of the second anode
electrode AE2, but greater than the area of the first anode
electrode AE1. In another example, the area of the first anode
electrode AE1 may be smaller than the area of the second anode
electrode AE2, and the area of the third anode electrode AE3 may be
greater than the areas of the first and second anode electrodes AE1
and AE2. However, the present disclosure is not limited to these
examples. In another example, the first, second, and third anode
electrodes AE1, AE2, and AE3 may have substantially the same width
or substantially the same area.
[0082] The first, second, and third anode electrodes AE1, AE2, and
AE3 may be reflective electrodes, in which case, each of the first,
second, and third anode electrodes AE1, AE2, and AE3 may include a
metal layer formed of a metal such as Ag, Mg, Al, Pt, Pd, Au, Ni,
Nd, Ir, or Cr. In some embodiments, each of the first, second, and
third anode electrodes AE1, AE2, and AE3 may further include a
metal oxide layer which is deposited on the metal layer. For
example, the first, second, and third anode electrodes AE1, AE2,
and AE3 may have a double-layer structure of ITO/Ag, Ag/ITO,
ITO/Mg, ITO/MgF or a multilayer structure of ITO/Ag/ITO.
[0083] A pixel-defining film 150 may be disposed on the first,
second, and third anode electrodes AE1, AE2, and AE3. The
pixel-defining film 150 may include openings which expose the
first, second, and third anode electrodes AE1, AE2, and AE3 and may
define the first, second, and third light-emitting areas LA1, LA2,
and LA3 and the non-light-emitting area NLA. That is, part of the
first anode electrode AE1 that is not covered, but exposed, by the
pixel-defining film 150 may correspond to the first light-emitting
area LA1, part of the second anode electrode AE2 that is not
covered, but exposed, by the pixel-defining film 150 may correspond
to the second light-emitting area LA2, and part of the third anode
electrode AE3 that is not covered, but exposed, by the
pixel-defining film 150 may correspond to the third light-emitting
area LA3. An area in which the pixel-defining film 150 is disposed
may be the non-light-emitting area NLA.
[0084] In some embodiments, the pixel-defining film 150 may include
an organic insulating material such as an acrylic resin, an epoxy
resin, a phenolic resin, a polyamide resin, a polyimide resin, an
unsaturated polyester resin, a polyphenylene resin, a polyphenylene
sulfide resin, or benzocyclobutene (BCB).
[0085] In some embodiments, the pixel-defining film 150 may overlap
with color patterns 250 of FIG. 12 and light-shielding members 220
of FIG. 13. For example, as illustrated in FIG. 5, the
pixel-defining film 150 may overlap with first, second, and third
light-shielding members 221, 222, and 223. Also, the pixel-defining
film 150 may overlap with first, second, and third color patterns
251, 252, and 253.
[0086] The pixel-defining film 150 may overlap with color
mixing-preventing members 370.
[0087] As illustrated in FIGS. 5 and 8 through 11, a light-emitting
layer OL may be disposed on the first, second, and third anode
electrodes AE1, AE2, and AE3.
[0088] In some embodiments, the light-emitting layer OL may be in
the shape of a continuous film formed in and across the
light-emitting areas (LA1, LA2, LA3, LA4, LA5, and LA6) and the
non-light-emitting area NLA.
[0089] As illustrated in FIGS. 5 and 8 through 11, a cathode
electrode CE may be disposed on the light-emitting layer OL.
[0090] In some embodiments, the cathode electrode CE may have
translucency or transparency. In a case where the cathode electrode
CE is translucent, the cathode electrode CE may include Ag, Mg, Cu,
Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF/Ca, LiF/Al, Mo, Ti, or
a compound or mixture thereof, e.g., the mixture of Ag and Mg. In a
case where the cathode electrode CE is tens to hundreds of
angstroms in thickness, the cathode electrode CE may be
translucent.
[0091] In a case where the cathode electrode CE is transparent, the
cathode electrode CE includes a transparent conductive oxide (TCO).
For example, the cathode CE may include tungsten oxide (WxOx),
titanium oxide (TiO.sub.2), indium tin oxide (ITO), indium zinc
oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), or
magnesium oxide (MgO).
[0092] The first anode electrode AE1, the light-emitting layer OL,
and the cathode electrode CE may form a first light-emitting
element ED1, the second anode electrode AE2, the light-emitting
layer OL, and the cathode electrode CE may form a second
light-emitting element ED2, and the third anode electrode AE3, the
light-emitting layer OL, and the cathode electrode CE may form a
third light-emitting element ED3. The first, second, and third
light-emitting elements ED1, ED2, and ED3 may emit emitted light
L1, and the emitted light L1 may be provided to the color
conversion substrate 30.
[0093] As illustrated in FIG. 6, the emitted light L1, which is
emitted finally by the light-emitting element OL, may be the
mixture of first and second components L11 and L12. The first and
second components L11 and L12 may have a peak wavelength of about
440 nm to about 610 nm. That is, the emitted light L1 may not
include a red-light component. Here, the term "peak wavelength", as
used herein, may refer to the wavelength where the spectrum reaches
its maximum intensity.
[0094] The light-emitting layer OL may include a first stack ST1
which includes a first light-emitting layer EML1, a second stack
ST2 which is disposed on the first stack ST1 and includes a second
light-emitting layer EML2, a third stack ST3 which is disposed on
the second stack ST2 and includes a third light-emitting layer
EML3, a first charge generating layer CGL1 which is disposed
between the first and second stacks ST1 and ST2, and a second
charge generating layer CGL2 which is disposed between the second
and third stacks ST2 and ST3. The first, second, and third stacks
ST1, ST2, and ST3 may be disposed to overlap with one another.
[0095] The first, second, and third light-emitting layers EML1,
EML2, and EML3 may be disposed to overlap with one another.
[0096] In some embodiments, light emitted by the first, second, and
third light-emitting layers EML1, EML2, and EML3 may have a peak
wavelength of less than 610 nm, and the first, second, and third
light-emitting layers EML1, EML2, and EML3 may not emit light
having a peak wavelength of about 610 nm to about 680 nm, i.e., red
light.
[0097] In some embodiments, the first, second, and third
light-emitting layers EML1, EML2, and EML3 may emit light of the
first color, i.e., blue light. For example, the first, second, and
third light-emitting layers EML1, EML2, and EML3 may all be blue
light-emitting layers and may include an organic material.
[0098] In some embodiments, at least one of the first, second, and
third light-emitting layers EML1, EML2, and EML3 may emit a first
blue light having a first peak wavelength, and the other
light-emitting layer(s) may emit a second blue light having a
second peak wavelength, which is different from the first peak
wavelength. For example, one of the first, second, and third
light-emitting layers EML1, EML2, and EML3 may emit the first blue
light having the first peak wavelength, and the other two
light-emitting layers may emit the second blue light having the
second peak wavelength. That is, the emitted light L1, which is
emitted finally by the light-emitting element OL, may be the
mixture of the first and second components L11 and L12, the first
component L11 may be the first blue light having the first peak
wavelength, and the second component L12 may be the second blue
light having the second peak wavelength.
[0099] In some embodiments, one of the first and second peak
wavelengths may range from about 440 nm to about 460 nm, and the
other peak wavelength may range from about 460 nm to about 480 nm.
However, the first and second peak wavelengths are not particularly
limited. In other embodiments, the first and second peak
wavelengths may both include 460 nm. In some embodiments, one of
the first blue light and the second blue light may be deep blue
light, and the other blue light may be sky blue light.
[0100] In some embodiments, the emitted light L1, which is emitted
from the light-emitting layer OL, may be blue light and may include
both long- and short-wavelength components. Thus, the
light-emitting layer OL can emit blue light having a broad range of
emission peaks as the emitted light L1. As a result, color
visibility at a side viewing angle can be improved as compared to
conventional light-emitting elements that emit blue light having
sharp emission peaks.
[0101] In some embodiments, each of the first, second, and third
light-emitting layers EML1, EML2, and EML3 may include a host and a
dopant. The material of the host is not particularly limited. For
example, tris(8-hydroxyquinoline)aluminum (Alq3),
4,4'-bis(N-carbazolyI)-1,1'-biphenyl (CBP), poly(n-vinylcabazole)
(PVK), 9,10-di(naphthalene-2-yl)anthracene (ADN),
4,4',4''-tris(carbazol-9-yl)-triphenylamine (TCTA),
1,3,5-tris(N-phenyl benzimidazole-2-yl)benzene (TPBi),
3-tert-butyl-9,10-di(naphth-2-yl)anthracene (TBADN),
distyrylarylene (DSA),
4,4'-bis(9-carbazolyl)-2,2''-dimethyl-biphenyl (CDBP), or
2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN) may be used as
the host.
[0102] For example, each of the first, second, and third
light-emitting layers EML1, EML2, and EML3, which emit blue light,
may include a fluorescent material containing one selected from the
group consisting of spiro-DPVBi, spiro-6P, distyryl-benzene (DSB),
DSA, a polyfluorene (PFO) polymer, and a poly(p-phenylene vinylene)
(PPV) polymer. In another example, each of the first, second, and
third light-emitting layers EML1, EML2, and EML3 may include a
phosphorescent material containing an organometallic complex such
as (4,6-F2ppy)2Irpic.
[0103] As already mentioned above, at least one of the first,
second, and third light-emitting layers EML1, EML2, and EML3 may
emit blue light having a different wavelength range from the other
light-emitting layer(s). In order to emit blue light of different
wavelength ranges, the first, second, and third light-emitting
layers EML1, EML2, and EML3 may be formed of the same material, but
the resonance distances of the first, second, and third
light-emitting layers EML1, EML2, and EML3 may be controlled (e.g.,
to be different from each other). Alternatively, in order to emit
blue light of different wavelength ranges, at least one of the
first, second, and third light-emitting layers EML1, EML2, and EML3
may include a different material from the other light-emitting
layer(s).
[0104] In other embodiments, one of the first, second, and third
light-emitting layers EML1, EML2, and EML3 may emit the first blue
light having the first peak wavelength, another one of the first,
second, and third light-emitting layers EML1, EML2, and EML3 may
emit the second blue light having the second peak wavelength, which
is different from the first peak wavelength, and the other (e.g.,
the remaining) light-emitting layer may emit the third blue light
having the third peak wavelength, which is different from the first
and second peak wavelengths. In the other embodiments, one of the
first, second, and third peak wavelengths may range from about 440
nm to about 460 nm, another one of the first, second, and third
peak wavelengths may range from about 460 nm to about 470 nm, and
the other (e.g., the remaining) peak wavelength may range from
about 470 nm to about 480 nm.
[0105] In the other embodiments, the emitted light L1, which is
emitted from the light-emitting layer OL, is blue light and
includes long-, mid-, and short-wavelength components. Thus, the
light-emitting layer OL can emit blue light having a broad range of
emission peaks as the emitted light L1. As a result, color
visibility at a side viewing angle can be improved as compared to
conventional light-emitting elements that emit blue light having
sharp emission peaks.
[0106] According to the other embodiments, optical efficiency can
be improved, and a long life (e.g., a long lifespan) can be
realized, as compared to conventional light-emitting elements that
do not employ a tandem structure in which a plurality of
light-emitting layers are stacked.
[0107] In the other embodiments, the material of the first, second,
and third light-emitting layers EML1, EML2, and EML3 may be the
same as already described above, and thus, a detailed description
thereof will be omitted.
[0108] In yet other embodiments, at least one of the first, second,
and third light-emitting layers EML1, EML2, and EML3 may emit light
of the first color, e.g., blue light, and the other light-emitting
layer(s) may emit light of the third color, e.g., green light.
Here, the peak wavelength of blue light emitted by the at least one
of the first, second, and third light-emitting layers EML1, EML2,
and EML3 may range from about 440 nm to about 480 nm or from about
460 nm to about 480 nm, and the peak wavelength of green light
emitted by the other light-emitting layer(s) may range from about
510 nm to about 550 nm.
[0109] For example, one of the first, second, and third
light-emitting layers EML1, EML2, and EML3 may be a green
light-emitting layer, and the other two light-emitting layers may
be blue light-emitting layers. In a case where two of the first,
second, and third light-emitting layers EML1, EML2, and EML3 are
blue-light emitting layers, blue light emitted by the blue-light
emitting layers may have the same peak wavelength range or
different wavelength ranges. In another example, two of the first,
second, and third light-emitting layers EML1, EML2, and EML3 may be
green light-emitting layers, and the other light-emitting layer may
be a blue light-emitting layer.
[0110] In the yet other embodiments, the emitted light L1, which is
emitted from the light-emitting layer OL, may be the mixture of the
first component L11, i.e., blue light, and the second component
L12, i.e., green light. For example, in a case where the first
component L11 is deep blue light and the second component L12 is
green light, the emitted light L1 may be sky blue light. In the yet
other embodiments, like in (e.g., similar to) some of the
above-described embodiments, the emitted light L1 is the mixture of
blue light and green light and includes long- and short-wavelength
components. Thus, the light-emitting layer OL can emit blue light
having a broad range of emission peaks as the emitted light L1. As
a result, color visibility at a side viewing angle can be improved
as compared to conventional light-emitting elements that emit blue
light having sharp emission peaks. Also, because the second
component L12 of the emitted light L1 is green light, the green
light component of light provided to the outside of the display
device 1 can be properly compensated for, and as a result, the
color reproducibility of the display device 1 can be improved.
[0111] In the yet other embodiments, the layer(s) from among the
first, second, and third light-emitting layers EML1, EML2, and EML3
that is/are green light-emitting layers may include a host and a
dopant, and the material of the host of the green light-emitting
layers is not particularly limited. For example, Alq3, CBP, PVK,
ADN, TCTA, TPBi, TBADN, DSA, CDBP, or MADN may be used as the host
of the green light-emitting layers.
[0112] For example, the dopant of the green light-emitting layers
may be a fluorescent material containing Alq3 or a phosphorescent
material such as Ir(ppy)3(fac-tris(2-phenylpyridine)iridium),
Ir(ppy)2(acac)(bis(2-phenylpyridine)(acetylacetonate)iridium(III)),
or Ir(mpyp)3(2-phenyl-4-methyl-pyridine iridium).
[0113] The first charge generating layer CGL1 may be disposed
between the first and second stacks ST1 and ST2. The first charge
generating layer CGL1 injects charges into the first, second, and
third light-emitting layers EML1, EML2, and EML3. The first charge
generating layer CGL1 controls the charge balance between the first
and second stacks ST1 and ST2. The first charge generating layer
CGL1 may include an n-type charge generating layer CGL11 and a
p-type charge generating layer CGL12. The p-type charge generating
layer CGL12 may be disposed on the n-type charge generating layer
CGL11, and between the n-type charge generating layer CGL11 and the
second stack ST2.
[0114] The first charge generating layer CGL1 may have a structure
in which the n-type charge generating layer CGL11 and the p-type
charge generating layer CGL12 are bonded together. The n-type
charge generating layer CGL11 is disposed to be closer to the
first, second, and third anode electrodes AE1, AE2, and AE3 than to
the cathode electrode CE. The p-type charge generating layer CGL12
is disposed to be closer to the first, second, and third anode
electrodes AE1, AE2, and AE3 than to the cathode electrode CE. The
n-type charge generating layer CGL11 provides electrons to the
first light-emitting layer EML1, which is adjacent to the first,
second, and third anode electrodes AE1, AE2, and AE3, and the
p-type charge generating layer CGL12 provides holes to the second
light-emitting layer EML2, which is included in the second stack
ST2. The first charge-generating layer CGL1 is disposed between the
first and second stacks ST1 and ST2 and provides charges to the
first, second, and third light-emitting layers EML1, EML2, and
EML3, thereby improving emission efficiency and lowering a driving
voltage.
[0115] The first stack ST1 may be disposed on the first, second,
and third anode electrodes AE1, AE2, and AE3, and may further
include a first hole transport layer HTL1, a first electron block
layer BIL1, and a first electron transport layer ETL1.
[0116] The first hole transport layer HTL1 may be disposed on the
first, second, and third anode electrodes AE1, AE2, and AE3. The
first hole transport layer HTL1 facilitates the transport of holes
and may include a hole transport material. The hole transport
material may include a carbazole-based derivative (such as
N-phenylcarbazole or polyvinylcarbazole), a fluorene-based
derivative, a triphenylamine-based derivative (such as
N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1-biphenyl]-4,4'-diamine
(TPD) or TCTA), N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine (NPB),
or 4,4'-cyclohexylidene bis[N,N-bis(4-methylphenyl)benzenamine]
(TAPC), but the present disclosure is not limited thereto. In some
embodiments, the first hole transport layer HTL1 may be formed as a
single layer. Alternatively, in other embodiments, the first hole
transport layer HTL1 may be formed as multiple layers, in which
case, the multiple layers may include different materials.
[0117] The first electron block layer BIL1 may be disposed on the
first hole transport layer HTL1, and between the first hole
transport layer HTL1 and the first light-emitting layer EML1. The
first electron block layer BIL1 may include a hole transport
material and a metal or a metal oxide to prevent or substantially
prevent electrons generated in the first light-emitting layer EML1
from infiltrating into the first hole transport layer HTL1. In some
embodiments, the first hole transport layer HTI1 and the first
electron block layer BIL1 may each be formed as a single layer, but
the present disclosure is not limited thereto. In other
embodiments, the first electron block layer BIL1 may not be
provided.
[0118] The first electron transport layer ETL1 may be disposed on
the first light-emitting layer EML1, and between the first charge
generating layer CGL1 and the first light-emitting layer EML1. In
some embodiments, the first electron transport layer ETL1 may
include an electron transport material such as Alq3, TPBi,
2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP),
4,7-diphenyl-1,10-phenanthroline (Bphen),
3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ),
4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ),
2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (tBu-PBD),
bis(2-methyl-8-quinolinolato-N1,O8)-(1,1'-biphenyl-4-olato)aluminum
(BAlq), berylliumbis(benzoquinolin-10-olate (Bebq2), ADN, or a
mixture thereof, but the present disclosure is not limited thereto.
In some embodiments, the first electron transport layer ETL1 may be
formed as a single layer. In other embodiments, the first electron
transport layer ETL1 may be formed as multiple layers, in which
case, the multiple layers may include different materials.
[0119] The second stack ST2 may be disposed on the first charge
generating layer CGL1 and may further include a second hole
transport layer HTL2, a second electron block layer BIL2, and a
second electron transport layer ETL1.
[0120] The second hole transport layer HTL2 may be disposed on the
first charge generating layer CGL1. The second hole transport layer
HTL2 may be formed of the same material as the first hole transport
layer HTL1 or may include at least one selected from among the
above-described exemplary materials that can be included in the
first hole transport layer HTL1. The second hole transport layer
HTL2 may be formed as a single layer. Alternatively, the second
hole transport layer HTL2 may be formed as multiple layers, in
which case, the multiple layers may include different
materials.
[0121] The second electron block layer BIL2 may be disposed on the
second hole transport layer HTL2, and between the second hole
transport layer HTL2 and the first light-emitting layer EML2. The
second electron block layer BIL2 may be formed of the same material
and the same structure as the first electron block layer BIL1 or
may include at least one selected from among the above-described
exemplary materials that can be included in the first electron
block layer BIL1 . In some embodiments, the second electron block
layer BIL1 may not be provided.
[0122] The second electron transport layer ETL2 may be disposed on
the second light-emitting layer EML2, and between the second charge
generating layer CGL2 and the second light-emitting layer EML2. The
second electron transport layer ETL2 may be formed of the same
material and the same structure as the first electron transport
layer ETL1 or may include at least one selected from among the
above-described exemplary materials that can be included in the
first electron transport layer ETL1. The second electron transport
layer ETL2 may be formed as a single layer. Alternatively, the
second electron transport layer ETL2 may be formed as multiple
layers, in which case, the multiple layers may include different
materials.
[0123] The second charge generating layer CGL2 may be disposed on
the second stack ST2, and between the second and third stacks ST2
and ST3.
[0124] The second charge generating layer CGL2 may have the same
structure as the first charge generating layer CGL1. For example,
the second charge generating layer CGL2 may include an n-type
charge generating layer CGL21 which is disposed adjacent to the
second stack ST2 and a p-type charge generating layer CGL22 which
is disposed adjacent to the cathode electrode CE. The p-type charge
generating layer CGL22 may be disposed on the n-type charge
generating layer CGL21.
[0125] The second charge generating layer CGL2 may have a structure
in which the n-type charge generating layer CGL21 and the p-type
charge generating layer CGL12 are bonded together. The first and
second charge generating layers CGL1 and CGL2 may be formed of
different materials or may be formed of the same material.
[0126] The second stack ST2 may be disposed on the second charge
generating layer CGL2 and may further include a third hole
transport layer HTL3 and a third electron transport layer ETL3.
[0127] The third hole transport layer HTL3 may be disposed on the
second charge generating layer CGL2. The third hole transport layer
HTL3 may be formed of the same material as the first hole transport
layer HTL1 or may include at least one selected from among the
above-described exemplary materials that can be included in the
first hole transport layer HTL1. The third hole transport layer
HTL3 may be formed as a single layer. Alternatively, the third hole
transport layer HTL3 may be formed as multiple layers, in which
case, the multiple layers may include different materials.
[0128] The third electron transport layer ETL3 may be disposed on
the third light-emitting layer EML3, and between the cathode
electrode CE and the third light-emitting layer EML3. The third
electron transport layer ETL3 may be formed of the same material
and the same structure as the first electron transport layer ETL1
or may include at least one selected from among the above-described
exemplary materials that can be included in the first electron
transport layer ETL1. The third electron transport layer ETL3 may
be formed as a single layer. Alternatively, the third electron
transport layer ETL3 may be formed as multiple layers, in which
case, the multiple layers may include different materials.
[0129] In one embodiment, a hole injection layer (HIL) may be
further disposed between the first stack ST1 and the first anode
electrode AE1, between the second stack ST2 and the first charge
generating layer CGL1, and/or between the third stack ST3 and the
second charge generating layer CGL2. The HIL may facilitate the
injection of holes into the first, second, and third light-emitting
layers EML1, EML2, and EML3. In some embodiments, the HIL may be
formed of at least one selected from among copper phthalocyanine
(CuPc), poly(3,4)-ethylenedioxythiophene (PEDOT), polyaniline
(PANI), and N,N-dinaphthyl-N,N'-diphenyl benzidine (NPD), but the
present disclosure is not limited thereto. In some embodiments,
HILs may be disposed between the first stack ST1 and the first
anode electrode AE1, between the second stack ST2 and the first
charge generating layer CGL1, and between the third stack ST3 and
the second charge generating layer CGL2.
[0130] In one embodiment, an electron injection layer (EIL) may be
further disposed between the third electron transport layer ETL3
and the cathode electrode CE, between the second charge generating
layer CGL2 and the second stack ST2, and/or between the first
charge generating layer CGL1 and the first stack ST1. The EIL may
facilitate the injection of electrons and may include Alq3, PBD,
TAZ, spiro-PBD, BAlq, or SAlq, but the present disclosure is not
limited thereto. Also, the EIL may include a metal halide compound
and may include, for example, at least one selected from the group
consisting of MgF.sub.2, LiF, NaF, KF, RbF, CsF, FrF, LiI, NaI, KI,
RbI, CsI, FrI, and CaF.sub.2, but the present disclosure is not
limited thereto. Also, the EIL may include a lanthanide material
such as Yb, Sm, or Eu. Also, the EIL may include both a metal
halide material and a lanthanide material (e.g., RbI:Yb or KI:Yb),
in which case, the EIL may be formed by codepositing the metal
halide material and the lanthanide material. In some embodiments,
the ElLs may be disposed between the third electron transport layer
ETL3 and the cathode electrode CE, between the second charge
generating layer CGL2 and the second stack ST2, and between the
first charge generating layer CGL1 and the first stack ST1.
[0131] The structure of the light-emitting layer OL may suitably
vary. For example, the light-emitting layer OL may be modified into
a light-emitting layer OLa of FIG. 7. The light-emitting layer OLa
of FIG. 7, unlike the light-emitting layer OL of FIG. 6, may
further include a fourth stack ST4 and a third charge generating
layer CGL3, which are disposed between the third stack ST3 and the
second stack ST2.
[0132] The fourth stack ST4 may include a fourth light-emitting
layer EML4 and may further include a fourth hole transport layer
HTL4, a third electron block layer BIL3, and a fourth electron
transport layer ETL4.
[0133] The first, second, third, and fourth light-emitting layer
EML1, EML2, EML3, and EML4 may emit light of the first color, e.g.,
blue light. At least one of the first, second, third, and fourth
light-emitting layer EML1, EML2, EML3, and EML4 and at least one
other of the first, second, third, and fourth light-emitting layer
EML1, EML2, EML3, and EML4 may emit blue light of different peak
wavelength ranges.
[0134] Alternatively, at least one of the first, second, third, and
fourth light-emitting layer EML1, EML2, EML3, and EML4 may emit
green light, and at least one other of the first, second, third,
and fourth light-emitting layer EML1, EML2, EML3, and EML4 may emit
blue light.
[0135] The fourth hole transport layer HTL4 may be disposed on the
second charge generating layer CGL2. The fourth hole transport
layer HTL4 may be formed of the same material as the first hole
transport layer HTL1 or may include at least one selected from
among the above-described exemplary materials that can be included
in the first hole transport layer HTL1. The fourth hole transport
layer HTL4 may be formed as a single layer. Alternatively, the
fourth hole transport layer HTL4 may be formed as multiple layers,
in which case, the multiple layers may include different
materials.
[0136] The third electron block layer BIL3 may be disposed on the
fourth hole transport layer HTL4, and between the fourth hole
transport layer HTL4 and the fourth light-emitting layer EML4. The
third electron block layer BIL3 may be formed of the same material
and the same structure as the first electron block layer BIL1 or
may include at least one selected from among the above-described
exemplary materials that can be included in the first electron
block layer BIL1 . In some embodiments, the third electron block
layer BIL3 may not be provided.
[0137] The fourth electron transport layer ETL4 may be disposed on
the fourth light-emitting layer EML4, and between the third charge
generating layer CGL3 and the fourth light-emitting layer EML4. The
fourth electron transport layer ETL4 may be formed of the same
material and the same structure as the first electron transport
layer ETL1 or may include at least one selected from among the
above-described exemplary materials that can be included in the
first electron transport layer ETL1. The fourth electron transport
layer ETL4 may be formed as a single layer. Alternatively, the
fourth electron transport layer ETL4 may be formed as multiple
layers, in which case, the multiple layers may include different
materials.
[0138] The third charge generating layer CGL3 may have the same
structure as the first charge generating layer CGL1. For example,
the third charge generating layer CGL3 may include an n-type charge
generating layer CGL31 which is disposed adjacent to the second
stack ST2 and a p-type charge generating layer CGL32 which is
disposed adjacent to the cathode electrode CE. The p-type charge
generating layer CGL32 may be disposed on the n-type charge
generating layer CGL31.
[0139] In one embodiment, an EIL may be further disposed between
the fourth stack ST4 and the third charge generating layer CGL3,
and an HIL may be further disposed between the fourth stack ST4 and
the second charge generating layer CGL2.
[0140] Both the light-emitting layer OL of FIG. 6 and the
light-emitting layer OLa of FIG. 7 may not include red
light-emitting layers and thus may not emit light of the second
color, e.g., red light. That is, the emitted light L1 may not
include any components having a peak wavelength of about 610 nm to
about 650 nm.
[0141] As illustrated in FIGS. 5 through 9, a thin-film
encapsulation layer 170 is disposed on the cathode electrode CE.
The thin-film encapsulation layer 170 is disposed in common in the
first, second, and third light-emitting areas LA1, LA2, and LA3 and
in the non-light-emitting area NLA. In some embodiments, the
thin-film encapsulation layer 170 may directly cover the cathode
electrode CE. In some embodiments, a capping layer which covers the
cathode electrode CE may be further disposed between the thin-film
encapsulation layer 170 and the cathode electrode CE, in which
case, the thin-film encapsulation layer 170 may directly cover the
capping layer.
[0142] In some embodiments, the thin-film encapsulation layer 170
may include a first encapsulation inorganic film 171, an
encapsulation organic film 173, and a second encapsulation
inorganic film 175 which are sequentially stacked on the cathode
electrode CE.
[0143] In some embodiments, the first and second encapsulation
inorganic films 171 and 175 may be formed of silicon nitride,
aluminum nitride, zirconium nitride, titanium nitride, hafnium
nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium
oxide, tin oxide, cerium oxide, silicon oxynitride (SiON), or
lithium fluoride.
[0144] In some embodiments, the encapsulation organic film 173 may
be formed of an acrylic resin, a methacrylic resin, polyisoprene, a
vinyl resin, an epoxy resin, a urethane resin, a cellulose resin,
or a perylene resin.
[0145] The structure of the thin-film encapsulation layer 170 is
not particularly limited and may suitably vary.
[0146] A panel light-shielding member 190 may be disposed on the
thin-film encapsulation layer 170. The panel light-shielding member
190 may be disposed on the thin-film encapsulation layer 170 and
may be located in the non-light-emitting area NLA. The panel
light-shielding member 190 may prevent or reduce the infiltration
of light between adjacent light-emitting areas to prevent or reduce
color mixing, and as a result, color reproducibility can be further
improved.
[0147] In some embodiments, the panel light-shielding member 190
may be located in the non-light-emitting area NLA and may be
disposed to surround the light-emitting areas (LA1, LA2, LA3, LA4,
LA5, and LA6) in a plan view.
[0148] The panel light-shielding member 190 may include an organic
light-shielding material and may be formed by coating the organic
light-shielding material and subjecting the organic light-shielding
material to exposure (e.g., exposure to light).
[0149] The color conversion substrate 30 will hereinafter be
described with reference to FIGS. 12 through 15 and again to FIGS.
5 through 11.
[0150] FIG. 12 is a plan view illustrating the arrangement of first
color filters and color patterns in the color conversion substrate
of the display device of FIG. 1, FIG. 13 is a plan view
illustrating the arrangement of a light-shielding member in the
color conversion substrate of the display device of FIG. 1, FIG. 14
is a plan view illustrating the arrangement of second color filters
and third color filters in the color conversion substrate of the
display device of FIG. 1, and FIG. 15 is a plan view illustrating
the arrangement of first wavelength conversion patterns, second
wavelength conversion patterns, and light-transmitting patterns in
the color conversion substrate of the display device of FIG. 1.
[0151] Referring to FIGS. 5 through 15, a second base member 310
may be formed of a material having transparency. In some
embodiments, the second base member 310 may be a glass substrate or
a plastic substrate. In a case where the second base member 310 is
a plastic substrate, the second base member 310 may have
flexibility. In some embodiments, the second base member 310 may
include a glass or plastic substrate, and may further include a
separate layer, e.g., a buffer layer or an insulating layer, which
is disposed on the glass or plastic substrate.
[0152] In some embodiments, as already mentioned above, the
light-transmitting areas (TA1, TA2, TA3, TA4, TA5, and TA6) and the
light-blocking area BA may be defined on the second base member
310.
[0153] Referring to FIGS. 5 and 8 through 12, first color filters
231 and color patterns 250 may be disposed on a first surface of
the second base member 310 that faces the display substrate 10.
[0154] The first color filters 231 may be disposed on the first
surface of the second base member 310 and may be located in first
light-transmitting areas TA1 and fourth light-transmitting areas
TA4. In some embodiments, first color filters 231 in the first
light-transmitting areas TA1 and first color filters 231 in the
fourth light-transmitting areas TA4 may be isolated from one
another in the second direction D2. In some embodiments, seventh
color patterns 257 may be disposed between the first color filters
231 in the first light-transmitting areas TA1 and the first color
filters 231 in the fourth light-transmitting areas TA4. The seventh
color patterns 237 may be connected to the first color filters
231.
[0155] The first color filters 231 may selectively transmit light
of the first color (e.g., blue light) therethrough and may block or
absorb light of the second color (e.g., red light) and light of the
third color (e.g., green light). In some embodiments, the first
color filters 231 may be blue color filters and may include a blue
colorant such as a blue dye or pigment. The term "colorant", as
used herein, encompasses both a dye and a pigment.
[0156] In a display device, most of the external light is
reflected, which causes distortion of the color reproducibility of
the color conversion substrate 30. However, in a case where the
color patterns 250 are disposed on the second base member 310
according to embodiments of the present disclosure, the color
patterns 250 may absorb some of the external light introduced into
the color conversion substrate 30 from the outside of the display
device 1 and may thus reduce the amount of reflected light of the
external light. Therefore, the distortion of colors by the external
light may be reduced.
[0157] In some embodiments, the color patterns 250 may include a
blue colorant such as a blue dye or pigment. In some embodiments,
the color patterns 250 may be formed of the same material as the
first color filters 231 and may be formed during the formation of
the first color filters 231. That is, the first color filters 231
and the color patterns 250 may be formed concurrently (e.g., at the
same time) by applying a photosensitive organic material including
a blue colorant on the first surface of the second base member 310
and subjecting the photosensitive organic material to exposure and
development.
[0158] In some embodiments, a thickness TH2, in the third direction
D3, of the color patterns 250 may be substantially the same as a
thickness TH1, in the third direction D3, of the first color
filters 231. In a case where the color patterns 250 include a blue
colorant, external light or reflected light passing through the
color patterns 250 may have a blue wavelength range. The color
sensitivity of eyes (e.g., a user's eyes) varies depending on the
color of light. Specifically, light in the blue wavelength range
may be perceived less sensitively than light in a green or red
wavelength range. Thus, because the color patterns 250 include a
blue colorant, a user can perceive reflected light less
sensitively. That is, the reflected light is less perceptible to
the user.
[0159] The color patterns 250 may be disposed on the first surface
of the second base member 310 and may be located in the
light-blocking area BA. Also, the color patterns 250 may be
disposed to overlap with the non-light-emitting area NLA. In some
embodiments, the color patterns 250 may be in direct contact with
the first surface of the second base member 310. Also, in a case
where a separate buffer layer is provided on the first surface of
the second base member 310 to prevent or reduce the infiltration of
impurities, the color patterns 250 may also be in direct contact
with the buffer layer.
[0160] In some embodiments, the color patterns 250 may be disposed
in the entire light-blocking area BA. In some embodiments, the
color patterns 250 may include first color patterns 251 which are
disposed in first light-blocking areas BA1, second color patterns
252 which are disposed in second light-blocking areas BA2, third
color patterns 253 which are disposed in third light-blocking areas
BA3, fourth color patterns 254 which are disposed in fourth
light-blocking areas BA4, fifth color patterns 255 which are
disposed in fifth light-blocking areas BA5, sixth color patterns
256 which are disposed in sixth light-blocking areas BA6, and the
seventh color patterns 257 which are disposed in seventh
light-blocking areas BA7. In some embodiments, the seventh color
patterns 257 may be connected to the first color patterns 251, the
second color patterns 252, the third color patterns 253, the fourth
color patterns 254, the fifth color patterns 255, and the sixth
color patterns 256.
[0161] Also, the color patterns 250 may be connected to the first
color filters 231.
[0162] As illustrated in FIGS. 5, 8 through 11, and 13, the
light-shielding members 220 may be disposed on the first surface of
the second base member 310, which faces the display substrate 10.
The light-shielding members 220 may be disposed in the
light-blocking area BA and may block the transmission of light. In
some embodiments, the light-shielding members 220 may be arranged
in a substantially lattice structure in a plan view, as illustrated
in FIG. 13.
[0163] In some embodiments, the light-shielding members 220 may
include an organic light-shielding material and may be formed by
coating the organic light-shielding material and subjecting the
organic light-shielding material to exposure (e.g., exposure to
light).
[0164] As already mentioned above, external light may distort the
color reproducibility of the color conversion substrate 30.
However, in a case where the light-shielding members 220 are
disposed on the second base member 310, at least some external
light can be absorbed by the light-shielding members 220. As a
result, the distortion of colors by the reflection of external
light can be reduced. In some embodiments, the light-shielding
members 220 may prevent or reduce the infiltration of light between
adjacent light-emitting areas to prevent or reduce color mixing,
and as a result, color reproducibility can be further improved.
[0165] In some embodiments, the light-shielding members 220 may
include first light-shielding members 221 which are disposed in the
first light-blocking areas BA1, second light-shielding members 222
which are disposed in the second light-blocking areas BA2, third
light-shielding members 223 which are disposed in the third
light-blocking areas BA3, fourth light-shielding members 224 which
are disposed in the fourth light-blocking areas BA4, fifth
light-shielding members 225 which are disposed in the fifth
light-blocking areas BA5, sixth light-shielding members 226 which
are disposed in the sixth light-blocking areas BA6, and seventh
light-shielding members 227 which are disposed in the seventh
light-blocking areas BA7. In some embodiments, the first
light-shielding members 221, the second light-shielding members
222, and the third light-shielding members 223 may be connected to
the seventh light-shielding members 227, and the fourth
light-shielding members 224, the fifth light-shielding members 225,
and the sixth light-shielding members 226 may also be connected to
the seventh light-shielding members 227.
[0166] The light-shielding members 220 may be disposed on the color
patterns 250. In some embodiments, the first light-shielding
members 221 may be disposed on the first color patterns 251, the
second light-shielding members 222 may be disposed on the second
color patterns 252, the third light-shielding members 223 may be
disposed on the third color patterns 253, the fourth
light-shielding members 224 may be disposed on the fourth color
patterns 254, the fifth light-shielding members 225 may be disposed
on the fifth color patterns 255, the sixth light-shielding members
226 may be disposed on the sixth color patterns 256, and the
seventh light-shielding members 227 may be disposed on the seventh
color patterns 257.
[0167] The color patterns 250 are disposed between the
light-shielding members 220 and the second base member 310, and
thus, in some embodiments, the light-shielding members 220 may not
be in contact with the second base member 310.
[0168] As illustrated in FIGS. 5, 8 through 11, and 14, the second
color filters 233 and the third color filters 235 may be disposed
on the first surface of the second base member 310, which faces the
display substrate 10.
[0169] The second color filters 233 may be disposed in the second
light-transmitting areas TA2 and the fifth light-transmitting areas
TA5, and the third color filters 235 may be disposed in the third
light-transmitting areas TA3 and the sixth light-transmitting areas
TA6.
[0170] As illustrated in FIG. 5, in some embodiments, first sides
of the second color filters 233 may be located in the first
light-blocking areas BA1 and may be disposed on the first color
patterns 251 and the first light-shielding members 221. Also, in
some embodiments, second sides of the second color filters 233 may
be located in the second light-blocking areas BA2 and may be
disposed on the second color patterns 252 and the second
light-shielding members 222.
[0171] As illustrated in FIG. 5, in some embodiments, first sides
of the third color filters 235 may be located in the second
light-blocking areas BA2 and may be disposed on the second color
patterns 252 and the second light-shielding members 222. Also, in
some embodiments, second sides of the third color filters 235 may
be located in the third light-blocking areas BA3 and may be
disposed on the third color patterns 253 and the third
light-shielding members 223.
[0172] As illustrated in FIG. 14, in some embodiments, the second
color filters 233 and the third color filters 235 may be arranged
as stripes extending in the second direction D2 and may extend
across the seventh light-blocking areas BA7 between the first and
second rows RT1 and RT2. Thus, in the seventh light-blocking areas
BA7, the second color filters 233 and the third color filters 235
may be disposed on the seventh light-shielding members 227, and may
cover the seventh color patterns 257 and the seventh
light-shielding members 227, respectively, along the second
direction D2, but the present disclosure is not limited thereto. In
other embodiments, the second color filters 233 and/or the third
color filters 235 may be formed as island patterns isolated in the
second direction D2.
[0173] The second color filters 233 may block or absorb light of
the first color (e.g., blue light). That is, the second color
filters 233 may serve as blue light filters capable of blocking
blue light. In some embodiments, the second color filters 233 may
selectively transmit light of the second color (e.g., red light)
therethrough and may block or absorb light of the first color
(e.g., blue light) and light of the third color (e.g., green
light). For example, the second color filters 233 may be red color
filters and may include a red colorant such as a red dye or
pigment.
[0174] The third color filters 235 may block or absorb light of the
first color (e.g., blue light). That is, the third color filters
235 may also serve as blue light filters. In some embodiments, the
third color filters 235 may selectively transmit light of the third
color (e.g., green light) therethrough and may block or absorb
light of the first color (e.g., blue light) and light of the second
color (e.g., red light). For example, the third color filters 235
may be green color filters and may include a green colorant such as
a green dye or pigment.
[0175] As illustrated in FIGS. 5 and 8 through 11, a first capping
layer 391 which covers the light-shielding members 220, the color
patterns 250, the first color filters 231, the second color filters
233, and the third color filters 235 may be disposed on the first
surface of the second base member 310. In some embodiments, the
first capping layer 391 may be in direct contact with the first
color filters 231, the second color filters 233, and the third
color filters 235.
[0176] The first capping layer 391 may be further in contact with
the light-shielding members 220. For example, as illustrated in
FIG. 5, in the first light-blocking areas BA1, the first
light-shielding members 221 may be in direct contact with the first
capping layer 391, in the second light-blocking areas BA2, the
second light-shielding members 222 may be in direct contact with
the first capping layer 391, and in the third light-blocking areas
BA3, the third light-shielding members 223 may be in direct contact
with the first capping layer 391. Also, as illustrated in FIG. 8,
in the seventh light-blocking areas BA7, the seventh
light-shielding members 227 may also be in contact with the first
capping layer 391.
[0177] The first capping layer 391 may prevent or substantially
prevent the light-shielding members 220, the color patterns 250,
the first color filters 231, the second color filters 233, and the
third color filters 235 from being damaged or polluted by moisture
or air infiltrated from the outside of the display device 1. Also,
the first capping layer 391 may prevent or substantially prevent
the colorants of the first color filters 231, the second color
filters 233, and the third color filters 235 from diffusing to
other elements, e.g., first wavelength conversion patterns 340 and
second wavelength conversion patterns 350. In some embodiments, the
first capping layer 391 may be formed of an inorganic material. For
example, the first capping layer 391 may include silicon nitride,
aluminum nitride, zirconium nitride, titanium nitride, hafnium
nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium
oxide, tin oxide, cerium oxide, or silicon oxynitride.
[0178] As illustrated in FIGS. 5, 8 through 11, and 15,
light-transmitting patterns 330, the first wavelength conversion
patterns 340, and the second wavelength conversion patterns 350 may
be disposed on the first capping layer 391.
[0179] In some embodiments, the light-transmitting patterns 330,
the first wavelength conversion patterns 340, and the second
wavelength conversion patterns 350 may be formed by applying a
photosensitive material and subjecting the photosensitive material
to exposure and development, but the present disclosure is not
limited thereto. In other embodiments, the light-transmitting
patterns 330, the first wavelength conversion patterns 340, and the
second wavelength conversion patterns 350 may be formed by inkjet
printing.
[0180] The light-transmitting patterns 330 may be disposed on the
first capping layer 391 and may be located in the first
light-transmitting areas TA1 and the fourth light-transmitting
areas TA4. In some embodiments, as illustrated in FIG. 15, the
light-transmitting patterns 330 may be formed as stripes extending
in the second direction D2 and may extend across the seventh
light-blocking areas BA7 between the first and second rows RT1 and
RT2, but the present disclosure is not limited thereto. In other
embodiments, the light-transmitting patterns 330 may be formed as,
for example, island patterns, so that light-transmitting patterns
330 in the first light-transmitting areas TA1 can be isolated from
light-transmitting patterns 330 in the fourth light-transmitting
areas TA4.
[0181] The light-transmitting patterns 330 may transmit incident
light therethrough. As already mentioned above, emitted light L1
provided by the first light-emitting element ED1 may be the mixture
of sky blue light and deep blue light or the mixture of blue light
and green light. A component of the emitted light L1 in the blue
wavelength range may penetrate (e.g., pass through) the
light-transmitting patterns 330 and the first color filters 231 and
may then be emitted out of the display device 1. That is, first
light La which is emitted from the first light-transmitting areas
TA1 may be blue light.
[0182] In some embodiments, each of the light-transmitting patterns
may include a first base resin 331 and a first scatterer 333 which
is dispersed in the first base resin 331.
[0183] The first base resin 331 may be formed of a material with a
high light transmittance. In some embodiments, the first base resin
331 may be formed of an organic material. For example, the first
base resin 331 may include an epoxy resin, an acrylic resin, a
cardo resin, or an imide resin.
[0184] The first scatterer 333 may have a different refractive
index from the first base resin 331 and may form an optical
interface with the first base resin 331. For example, the first
scatterer 333 may be light-scattering particles. The material of
the first scatterer 333 is not particularly limited as long as it
can scatter at least some light passing through the
light-transmitting patterns 330. For example, the first scatterer
333 may include metal oxide particles or organic particles. The
metal oxide particles may be, for example, particles of titanium
oxide (TiO.sub.2), zirconium oxide (ZrO.sub.2), aluminum oxide
(Al.sub.2O.sub.3), indium oxide (In.sub.2O.sub.3), zinc oxide
(ZnO), or tin oxide (SnO.sub.2), and the organic particles may be,
for example, particles of an acrylic resin or a urethane resin. The
first scatterer 333 can scatter light in random directions
regardless of the incidence direction of the light without
substantially changing the wavelength of light passing through the
light-transmitting patterns 330.
[0185] The first wavelength conversion patterns 340 may be disposed
on the first capping layer 391 and may be located in the second
light-transmitting areas TA2 and the fifth light-transmitting areas
TA5. In some embodiments, as illustrated in FIG. 15, the first
wavelength conversion patterns 340 may be formed as stripes
extending in the second direction D2 and may extend across the
seventh light-blocking areas BA7 between the first and second rows
RT1 and RT2, but the present disclosure is not limited thereto. In
other embodiments, the first wavelength conversion patterns 340 may
be formed as, for example, island patterns, so that first
wavelength conversion patterns 340 in the second light-transmitting
areas TA2 can be isolated from first wavelength conversion patterns
340 in the fifth light-transmitting areas TA5.
[0186] The first wavelength conversion patterns 340 may convert or
shift the peak wavelength of incident light into a set or
predetermined peak wavelength. In some embodiments, the first
wavelength conversion patterns 340 may convert emitted light L1
provided by the second light-emitting element ED2 into red light
having a peak wavelength of about 610 nm to about 650 nm.
[0187] In some embodiments, each of the first wavelength conversion
patterns 340 may include a second base resin 341 and a first
wavelength shifter 345 which is dispersed in the second base resin
341 and may further include a second scatterer 343 which is
dispersed in the second base resin 341.
[0188] The second base resin 341 may be formed of a material with a
high light transmittance. In some embodiments, the second base
resin 341 may be formed of an organic material. In some
embodiments, the second base resin 341 may be formed of the same
material as the first base resin 331 or may include at least one of
the above-described exemplary materials that can be included in the
first base resin 331.
[0189] The first wavelength shifter 345 may convert or shift the
peak wavelength of incident light into a set or predetermined peak
wavelength. In some embodiments, the first wavelength shifter 345
may convert the emitted light L1 provided by the second
light-emitting element ED2, e.g., blue light, into red light having
a single peak wavelength of about 610 nm to about 650 nm.
[0190] Examples of the first wavelength shifter 345 include quantum
dots, quantum rods, and a phosphor. For example, the quantum dots
may be a particulate material that emits light of a particular
color in response to the transition of the electrons from the
conduction band to the valance band.
[0191] The quantum dots may be a semiconductor nanocrystal
material. Because the quantum dots have a set or predetermined band
gap depending on their composition and size, the quantum dots
absorb light and emit light of a set or predetermined wavelength.
The semiconductor nanocrystal material includes a group IV element,
a group II-VI compound, a group III-V compound, a group IV-VI
compound, and/or a combination thereof.
[0192] The group II-VI compound may be selected from the group
consisting of: a binary compound selected from among CdSe, CdTe,
ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and a mixture
thereof; a ternary compound selected from among InZnP, AgInS,
CuInS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe,
HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe,
HgZnTe, MgZnSe, MgZnS, and a mixture thereof; and a quaternary
compound selected from among HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe,
CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and a
mixture thereof.
[0193] The group III-V compound may be selected from the group
consisting of: a binary compound selected from among GaN, GaP,
GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and a
mixture thereof; a ternary compound selected from among GaNP,
GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb,
InGaP, InNP, InAlP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and a
mixture thereof; and a quaternary compound selected from among
GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb,
GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and a
mixture thereof.
[0194] The group IV-VI compound may be selected from the group
consisting of: a binary compound selected from among SnS, SnSe,
SnTe, PbS, PbSe, PbTe, and a mixture thereof; a ternary compound
selected from among SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe,
SnPbS, SnPbSe, SnPbTe, and a mixture thereof; and a quaternary
compound selected from among SnPbSSe, SnPbSeTe, SnPbSTe, and a
mixture thereof. The group IV element may be selected from the
group consisting of Si, Ge, and a mixture thereof. The group IV
compound may be a binary compound selected from among SiC, SiGe,
and a mixture thereof.
[0195] These binary, ternary, or quaternary compounds may exist in
a uniform concentration or in a partially different concentration
throughout the particles. The quantum dots may have a core-shell
structure in which one quantum dot surrounds another quantum dot.
The interfaces between the cores and the shells of the quantum dots
may have a concentration gradient in which the concentration of the
element(s) in the shells of the quantum dots gradually decreases
toward the centers of the shells of the quantum dots (e.g., from
the interface between the cores and the shells).
[0196] In some embodiments, the quantum dots may have a core-shell
structure including (e.g., consisting of) a core including the
above-described semiconductor nanocrystal material and a shell
surrounding the core. The shells of the quantum dots may serve as
protective layers for maintaining the semiconductor characteristics
of the quantum dots by preventing or reducing chemical denaturation
of the cores of the quantum dots and/or as charging layers for
imparting electrophoretic characteristics to the quantum dots. The
shells of the quantum dots may have a single-layer structure or a
multilayer structure. The interfaces between the cores and the
shells of the quantum dots may have a concentration gradient in
which the concentration of the element(s) at the shells of the
quantum dots gradually decreases toward the centers of the shells
of the quantum dots (e.g., from the interface between the cores and
the shells). The shells of the quantum dots may include a metal or
non-metal oxide, a semiconductor compound, or a combination
thereof.
[0197] For example, the metal or non-metal oxide may be a binary
compound such as SiO.sub.2, Al.sub.2O.sub.3, TiO.sub.2, ZnO, MnO,
Mn.sub.2O.sub.3, Mn.sub.3O.sub.4, CuO, FeO, Fe.sub.2O.sub.3,
Fe.sub.3O.sub.4, CoO, Co.sub.3O.sub.4, or NiO, or a ternary
compound such as MgAl.sub.2O.sub.4, CoFe.sub.2O.sub.4,
NiFe.sub.2O.sub.4, or CoMn.sub.2O.sub.4, but the present disclosure
is not limited thereto.
[0198] For example, the semiconductor compound may be CdS, CdSe,
CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe,
HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, or AlSb, but the present
disclosure is not limited thereto.
[0199] Light emitted by the first wavelength shifter 345 may have a
full width at half maximum (FMHM) of about 45 nm or less, about 40
nm or less, or about 30 nm or less, and thus, the purity of colors
displayed by the display device 1 and the color reproducibility of
the display device 1 can be further improved. Also, the first
wavelength shifter 345 can emit light in various directions
regardless of the incidence direction of the light. The side
visibility of the second color displayed in the second
light-transmitting areas TA2 can be improved.
[0200] Some of the emitted light L1 provided by the second
light-emitting element ED2 may be emitted as it passes through the
first wavelength conversion patterns 340 without being converted
into red light by the first wavelength shifter 345. A component of
the emitted light L1 that is incident upon the second color filters
233 without being converted by the first wavelength conversion
patterns 340 may be blocked by the second color filters 233. Red
light obtained from the emitted light L1 by the first wavelength
conversion patterns 340 may be emitted out of the display device 1
through the second color filters 233. That is, second light Lb
emitted from the second light-transmitting areas TA2 may be red
light.
[0201] The second scatterer 343 may have a different refractive
index from the second base resin 341 and may form an optical
interface with the first base resin 331. For example, the second
scatterer 343 may include light-scattering particles. The second
scatterer 343 is substantially the same as, or similar to, the
first scatterer 333, and thus, a detailed description thereof will
be omitted.
[0202] The second wavelength conversion patterns 350 may be
disposed on the first capping layer 391 and may be located in the
third light-transmitting areas TA3 and the sixth light-transmitting
areas TA6. In some embodiments, as illustrated in FIG. 15, the
second wavelength conversion patterns 350 may be formed as stripes
extending in the second direction D2 and may extend across the
seventh light-blocking areas BA7 between the first and second rows
RT1 and RT2, but the present disclosure is not limited thereto. In
other embodiments, the second wavelength conversion patterns 350
may be formed as, for example, island patterns, so that second
wavelength conversion patterns 350 in the third light-transmitting
areas TA3 can be isolated from second wavelength conversion
patterns 350 in the sixth light-transmitting areas TA6.
[0203] The second wavelength conversion patterns 350 may convert or
shift the peak wavelength of incident light into a set or
predetermined peak wavelength. In some embodiments, the second
wavelength conversion patterns 350 may convert emitted light L1
provided by the third light-emitting element ED3 into green light
having a peak wavelength of about 510 nm to about 550 nm.
[0204] In some embodiments, each of the second wavelength
conversion patterns 350 may include a third base resin 351 and a
second wavelength shifter 355 which is dispersed in the third base
resin 351 and may further include a third scatterer 353 which is
dispersed in the third base resin 351.
[0205] The third base resin 351 may be formed of a material with a
high light transmittance. In some embodiments, the third base resin
351 may be formed of an organic material. In some embodiments, the
third base resin 351 may be formed of the same material as the
first base resin 331 or may include at least one of the
above-described exemplary materials that can be included in the
first base resin 331.
[0206] The second wavelength shifter 355 may convert or shift the
peak wavelength of incident light into a set or predetermined peak
wavelength. In some embodiments, the second wavelength shifter 355
may convert blue light having a peak wavelength of about 440 nm to
about 480 nm into green light having a single peak wavelength of
about 510 nm to about 550 nm.
[0207] Examples of the second wavelength shifter 355 include
quantum dots, quantum rods, and a phosphor. The second wavelength
shifter 355 is substantially the same as, or similar to the first
wavelength shifter 345, and thus, a detailed description thereof
will be omitted.
[0208] In some embodiments, the first and second wavelength
shifters 345 and 355 may both be formed as (e.g., formed of)
quantum dots. In this case, the particle size of the first
wavelength shifter 345 may be greater than the particle size of the
second wavelength shifter 355.
[0209] The third scatterer 353 may have a different refractive
index from the third base resin 351 and may form an optical
interface with the third base resin 351. For example, the third
scatterer 353 may include light-scattering particles. The third
scatterer 353 is substantially the same as, or similar to, the
second scatterer 343, and thus, a detailed description thereof will
be omitted.
[0210] The emitted light L1 from the third light-emitting element
ED3 may be provided to the second wavelength conversion patterns
350, and the second wavelength shifter 355 may convert the emitted
light L1 into green light having a peak wavelength of about 510 nm
to about 550 nm.
[0211] In a case where the emitted light L1 is blue light (or the
mixture of deep blue light and sky blue light), some of the emitted
light L1 may be emitted as it passes through the second wavelength
conversion patterns 350 without being converted into red light by
the second wavelength shifter 355 and may be blocked by the third
color filters 235. Green light obtained from the emitted light L1
by the second wavelength conversion patterns 350 may be emitted out
of the display device 1 through the third color filters 235. That
is, third light Lc emitted from the third light-transmitting areas
TA3 may be green light.
[0212] In a case where the emitted light L1 is the mixture of deep
blue light and sky blue light, the emitted light L1 includes both
long- and short-wavelength components, and thus, the moving path of
emitted light L1 incident upon the second wavelength conversion
patterns 350 can be elongated. As a result, the amount of emitted
light L1 provided to the second wavelength shifter 355 can be
increased, and the light conversion efficiency of the second
wavelength conversion patterns 350 can also be increased.
Accordingly, the color reproducibility of the display device 1 can
be improved.
[0213] In some embodiments, the light conversion efficiency of the
second wavelength conversion patterns 350, which convert blue light
having a peak wavelength of about 440 nm to about 480 nm into green
light, may be lower than the light conversion efficiency of the
first wavelength conversion patterns 340, which convert blue light
having a peak wavelength of about 440 nm to about 480 nm into red
light. Thus, even if the same amount of blue light is provided to
the first wavelength conversion patterns 340 and the second
wavelength conversion patterns 350, the amount of third light Lc
emitted from the third light-transmitting areas TA3 may be smaller
than the amount of second light Lb emitted from the second
light-transmitting areas TA2, and as a result, the color
reproducibility of the display device 1 may be degraded.
[0214] In a case where the emitted light L1 is the mixture of blue
light and green light, a green light component of the emitted light
L1 may be emitted out of the third light-transmitting areas TA3
together with the third light Lc, which is green light obtained by
the second wavelength conversion patterns 350. That is, a
relatively small amount of green light can be compensated for by a
green light component emitted from the third light-emitting element
ED3, and as a result, the color reproducibility of the display
device 1 can be improved.
[0215] As illustrated in FIGS. 5 and 8 through 11, a second capping
layer 393 may be disposed on the light-transmitting patterns 330,
the first wavelength conversion patterns 340, and the second
wavelength conversion patterns 350. The second capping layer 393
may cover the light-transmitting patterns 330, the first wavelength
conversion patterns 340, and the second wavelength conversion
patterns 350. The second capping layer 393 may be in contact with
the first capping layer 391 and may seal the light-transmitting
patterns 330, the first wavelength conversion patterns 340, and the
second wavelength conversion patterns 350. Accordingly, the
light-transmitting patterns 330, the first wavelength conversion
patterns 340, and the second wavelength conversion patterns 350 can
be prevented or substantially prevented from being damaged or
polluted by moisture or air infiltrated from the outside of the
display device 1. In some embodiments, the second capping layer 393
may be formed of an inorganic material. In some embodiments, the
second capping layer 393 may be formed of the same material as the
first capping layer 391 or may include at least one selected from
among the above-described exemplary materials that can be included
in the first capping layer 391. In a case where the first and
second capping layers 391 and 393 are both formed of an inorganic
material, parts of the first and second capping layers 391 and 393
that are in direct contact with each other may be
inorganic-inorganic bonded (e.g., the first and second capping
layers 391 and 393 may form inorganic-inorganic bonds with each
other) and can thus effectively prevent or reduce the infiltration
of moisture or air from the outside.
[0216] As illustrated in FIGS. 5 and 11, the color
mixing-preventing members 370 may be disposed on the second capping
layer 393. The color mixing-preventing members 370 may be disposed
in the light-blocking area BA and may block the transmission of
light. Specifically, the color mixing-preventing members 370 may be
disposed between the light-transmitting patterns 330 and the first
wavelength conversion patterns 340 and between the first wavelength
conversion patterns 340 and the second wavelength conversion
patterns 350 to prevent or reduce color mixing between adjacent
light-transmitting areas. In some embodiments, the color
mixing-preventing members 370 may be formed as stripes extending in
the second direction D2.
[0217] In some embodiments, the color mixing-preventing members 370
may include an organic light-shielding material and may be formed
by coating the organic light-shielding material and subjecting the
organic light-shielding material to exposure (e.g., exposure to
light).
[0218] The filler member 70 may be disposed in the gap between the
color conversion substrate 30 and the display substrate 10. In some
embodiments, as illustrated in FIGS. 5 and 8 through 11, the filler
member 70 may be disposed between the second capping layer 393 and
the thin-film encapsulation layer 170 and between the color
mixing-preventing members 370 and the thin-film encapsulation layer
170. In some embodiments, the filler member 70 may be in direct
contact with the second capping layer 393 and the color
mixing-preventing members 370.
[0219] FIG. 16 is a cross-sectional view, taken along the line
X1-X1' of FIG. 3 or 4, of a display device according to another
embodiment of the present disclosure, FIG. 17 is a plan view
illustrating the arrangement of barrier walls in a color conversion
substrate of the display device of FIG. 16, and FIG. 18 is a plan
view illustrating the arrangement of first wavelength conversion
patterns, second wavelength conversion patterns, and
light-transmitting patterns in the color conversion substrate of
the display device of FIG. 16.
[0220] Referring to FIGS. 16 through 18, a display device 1a
includes a display substrate 10, a color conversion substrate 30a,
and a filler member 70. The display device 1a is substantially the
same as, or similar to, the display device 1 of FIGS. 5 and 8
through 11, except that the color conversion substrate 30a includes
barrier walls 380, and that the color mixing-preventing members 370
are not provided. The display device 1a will hereinafter be
described, focusing mainly on the differences with the display
device 1.
[0221] The barrier walls 380 may be located in a light-blocking
area BA and may overlap with a non-light-emitting area NLA. The
barrier walls 380 may be disposed to surround first light-emitting
areas LA1, second light-emitting areas LA2, third light-emitting
areas LA3, fourth light-emitting areas LA4, fifth light-emitting
areas LA5, and sixth light-emitting areas PA6. In some embodiments,
the barrier walls 380 may form a lattice shape in a plan view.
[0222] In a case where light-transmitting patterns 330, first
wavelength conversion patterns 340, and second wavelength
conversion patterns 350 are formed by inkjet printing, the barrier
walls 380 may serve as a guide for stably (e.g., accurately)
positioning an ink composition for forming the light-transmitting
patterns 330, the first wavelength conversion patterns 340, and the
second wavelength conversion patterns 350 at each desired
location.
[0223] In some embodiments, the barrier walls 380 may be formed of
an organic material, particularly, a photosensitive organic
material. The photosensitive organic material may be a negative
photosensitive material that is cured when irradiated with light,
but the present disclosure is not limited thereto.
[0224] In some embodiments, the barrier walls 380 may further
include a light-shielding material. That is, the barrier walls 380
may be located in light-blocking areas BA to block the transmission
of light. Specifically, the barrier walls 380 may be disposed
between the light-transmitting patterns 330 and the first
wavelength conversion patterns 340 and between the first wavelength
conversion patterns 340 and the second wavelength conversion
patterns 350 to prevent or reduce color mixing between adjacent
light-transmitting areas.
[0225] The light-transmitting patterns 330 may be disposed in first
light-transmitting areas TA1 and fourth light-transmitting areas
TA4, which are defined by the barrier walls 380.
[0226] The first wavelength conversion patterns 340 may be located
in second light-transmitting areas TA2 and fifth light-transmitting
areas TA5, which are defined by the barrier walls 380.
[0227] The second wavelength conversion patterns 350 may be located
in third light-transmitting areas TA3 and sixth light-transmitting
areas TA6, which are defined by the barrier walls 380.
[0228] In some embodiments, the barrier walls 380 may be disposed
on a first capping layer 391, and a second capping layer 393 may be
disposed on the barrier walls 380, the light-transmitting patterns
330, the first wavelength conversion patterns 340, and the second
wavelength conversion patterns 350. In this case, the
light-transmitting patterns 330, the first wavelength conversion
patterns 340, and the second wavelength conversion patterns 350 may
be in direct contact with the barrier walls 380.
[0229] FIG. 19 is a cross-sectional view, taken along the line
X1-X1' of FIG. 3 or 4, of a display device according to another
embodiment of the present disclosure.
[0230] Referring to FIG. 19, a display device 1b is substantially
the same as, or similar to, the display device 1 of FIGS. 5 and 8
through 11, except that a display substrate 10a includes all the
elements of the color conversion substrate 30 of FIG. 5, except for
the second base member 310, and that a color conversion substrate
30b includes only the second base member 310. The display device 1b
will hereinafter be described, focusing mainly on the differences
with the display device 1.
[0231] The display substrate 10a will hereinafter be described.
[0232] A panel light-shielding member 190 may be disposed on a
thin-film encapsulation layer 170.
[0233] A first capping layer 391a which covers the panel
light-shielding member 190 may be disposed on the thin-film
encapsulation layer 170. In some embodiments, the first capping
layer 391a may be in contact with the thin-film encapsulation layer
170 and the panel light-shielding member 190. The first capping
layer 391a is substantially the same as the first capping layer 391
of the display device 1 of FIG. 5, and thus, a detailed description
thereof will be omitted.
[0234] Light-transmitting patterns 330, first wavelength conversion
patterns 340, and second wavelength conversion patterns 350 may be
disposed on the first capping layer 391a.
[0235] The light-transmitting patterns 330 may be located in first
light-emitting areas LA1, the first wavelength conversion patterns
340 may be located in second light-emitting areas LA2, and the
second wavelength conversion patterns 350 may be located in third
light-emitting areas LA3.
[0236] In some embodiments, as illustrated in FIG. 15, the
light-transmitting patterns 330, the first wavelength conversion
patterns 340, and the second wavelength conversion patterns 350 may
be formed as stripes.
[0237] A second capping layer 393a may be disposed on the
light-transmitting patterns 330, the first wavelength conversion
patterns 340, and the second wavelength conversion patterns 350.
The second capping layer 393a may cover the light-transmitting
patterns 330, the first wavelength conversion patterns 340, and the
second wavelength conversion patterns 350. The second capping layer
393a is substantially the same as the second capping layer 393 of
the display device 1 of FIG. 5, and thus, a detailed description
thereof will be omitted.
[0238] Color mixing-preventing members 370 may be disposed on the
second capping layer 393a. The color mixing-preventing members 370
may be located in a non-light-emitting area NLA and may block the
transmission of light. The color mixing-preventing members 370 may
be disposed between the light-transmitting patterns 330 and the
first wavelength conversion patterns 340 and between the first
wavelength conversion patterns 340 and the second wavelength
conversion patterns 350 to prevent or reduce color mixing between
adjacent light-emitting areas.
[0239] First color filters 231a and color patterns 250a may be
disposed on the second capping layer 393a and the color
mixing-preventing members 370.
[0240] The first color filters 231a may be disposed on the second
capping layer 393a and may be located in the first light-emitting
areas LA1. In some embodiments, the first color filters 231a may be
blue color filters and may include a blue colorant such as a blue
dye or pigment.
[0241] The color patterns 250a may be disposed on the second
capping layer 393a and may be located in the non-light-emitting
area NLA. The color patterns 250a may overlap with the color
mixing-preventing members 370. The color patterns 250a, like (e.g.,
similar to) the color patterns 250 of FIG. 12, may form a lattice
shape. In some embodiments, the color patterns 250a may be in
direct contact with the color mixing-preventing members 370. In
some embodiments, the color patterns 250a may be formed of the same
material as the first color filters 231a and may be connected to
the first color filters 231a. In some embodiments, the thickness of
the color patterns 250a may be substantially the same as the
thickness of the first color filters 231a. The color patterns 250a
are substantially the same as the color patterns 250 of the display
device 1 of FIG. 5, and thus, a detailed description thereof will
be omitted.
[0242] Light-shielding members 220a may be disposed on the color
patterns 250a. The light-shielding members 220a may be located in
the non-light-emitting area NLA and may block the transmission of
light. In some embodiments, the light-shielding members 220a, like
(e.g., similar to) the light-shielding members 220 of FIG. 13, may
be arranged in a lattice structure in a plan view.
[0243] In some embodiments, the light-shielding members 220a may
include an organic light-shielding material and may be formed by
coating the organic light-shielding material and subjecting the
organic light-shielding material to exposure (e.g., exposure to
light).
[0244] Second color filters 233a and third color filters 235a may
be disposed on the second capping layer 393a and the color
mixing-preventing members 370.
[0245] The second color filters 233a may be disposed on the second
capping layer 393a and may be located in the second light-emitting
areas LA2. In some embodiments, the second color filters 233a may
be red color filters and may include a red colorant such as a red
dye or pigment. In some embodiments, both ends of each of the
second color filters 233a may be located in part in the
non-light-emitting area NLA and may overlap with the
light-shielding members 220a or the color patterns 250a.
[0246] The third color filters 235a may be disposed on the second
capping layer 393a and may be located in the third light-emitting
areas LA3. In some embodiments, the third color filters 235a may be
green color filters and may include a green colorant such as a
green dye or pigment. In some embodiments, both ends of each of the
third color filters 235a may be located in part in the
non-light-emitting area NLA and may overlap with the
light-shielding members 220a or the color patterns 250a.
[0247] The color conversion substrate 30b, which includes the
second base member 310, may be disposed on the display substrate
10a, and a filler member 70 may be disposed between the display
substrate 10a and the color conversion substrate 30b.
[0248] The color conversion substrate 30b and the filler member 70
may not be provided.
[0249] The display device 1b can reduce the alignment tolerance
between the elements in each light-emitting area (e.g., the
alignment tolerance between a light-emitting element and a
wavelength conversion pattern, between a pixel-defining film and a
color mixing-preventing member, or between the pixel-defining film
and a light-shielding member).
[0250] FIG. 20 is a cross-sectional view, taken along the line
X1-X1' of FIG. 3 or 4, of a display device according to another
embodiment of the present disclosure.
[0251] Referring to FIG. 20, a display device 1c is substantially
the same as, or similar to, the display device 1b of FIG. 19,
except that it does not include the panel light-shielding members
190 and the color mixing-preventing members 370, but includes
barrier walls 380. The display device 1c will hereinafter be
described, focusing mainly on the differences with the display
device 1b.
[0252] The barrier walls 380 may be disposed on a thin-film
encapsulation layer 170. The barrier walls 380 may be located in a
light-blocking area BA and may form a lattice shape in a plan view,
as illustrated in FIG. 17.
[0253] As already mentioned above with reference to FIGS. 16
through 18, the barrier walls 380 may include a photosensitive
material and may further include a light-shielding material.
[0254] A first capping layer 391a which covers the barrier walls
380 may be disposed on the thin-film encapsulation layer 170.
[0255] Light-transmitting patterns 330, first wavelength conversion
patterns 340, and second wavelength conversion patterns 350 may be
disposed on the first capping layer 391a.
[0256] The light-transmitting patterns 330, the first wavelength
conversion patterns 340, and the second wavelength conversion
patterns 350 may be formed by inkjet printing, and the barrier
walls 380 may serve as a guide for stably (e.g., accurately)
positioning an ink composition for forming the light-transmitting
patterns 330, the first wavelength conversion patterns 340, and the
second wavelength conversion patterns 350 at each desired
location.
[0257] The light-transmitting patterns 330 may be located in first
light-emitting areas LA1 which are defined by the barrier walls
380.
[0258] The first wavelength conversion patterns 340 may be located
in second light-emitting areas LA2 which are defined by the barrier
walls 380.
[0259] The second wavelength conversion patterns 350 may be located
in third light-emitting areas LA3 which are defined by the barrier
walls 380.
[0260] A second capping layer 393a may be disposed on the
light-transmitting patterns 330, the first wavelength conversion
patterns 340, and the second wavelength conversion patterns
350.
[0261] First color filters 231a and color patterns 250a may be
disposed on the second capping layer 393a.
[0262] The first color filters 231a may be disposed on the second
capping layer 393a and may be located in the first light-emitting
areas LA1. The color patterns 250a may be disposed on the second
capping layer 393a and may be located in a non-light-emitting area
NLA.
[0263] Light-shielding members 220a may be disposed on the color
patterns 250a. The light-shielding members 220a may be located in
the non-light-emitting area NLA and may block the transmission of
light.
[0264] Second color filters 233a and third color filters 235a may
be disposed on the second capping layer 393a. The second color
filters 233a may be disposed on the second capping layer 393a and
may be located in the second light-emitting areas LA2 to overlap
with the first wavelength conversion patterns 340. The third color
filters 235a may be disposed on the second capping layer 393a and
may be located in the third light-emitting areas LA3 to overlap
with the second wavelength conversion patterns 350.
[0265] A color conversion substrate 30b which includes a second
base member 310 may be disposed on a display substrate 10b, and a
filler member 70 may be disposed between the display substrate 10b
and the color conversion substrate 30b.
[0266] The color conversion substrate 30b and the filler member 70
may not be provided.
[0267] According to the above-described embodiments, the distortion
of colors by the reflection of external light can be reduced, and
the display quality of a display device can be improved.
[0268] Also, any differences in the amount of light between
different colors that may be caused by differences in light
conversion efficiency between wavelength conversion patterns can be
compensated for with light emitted from OLEDs. Accordingly, any
differences in the amount of emitted light between different colors
can be reduced, and as a result, the color reproducibility and
display quality of a display device can be improved.
[0269] Also, because the peak wavelength range of light emitted
from each light-emitting element can be widened, the side viewing
angles of a display device can be improved.
[0270] The effects of the present invention are not limited by the
foregoing, and other various effects are anticipated herein.
[0271] Although the preferred embodiments of the present invention
have been disclosed for illustrative purposes, those skilled in the
art will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying claims,
and equivalents thereof.
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